SURE | Meaning, Definition In Cambridge English Dictionary

Meaning of sure in English sureadjective uk /ʃɔːr/ us /ʃʊr/ Add to word list Add to word list A2 certain; without any doubt: "What's wrong with him?" "I'm not really sure."sure (that) I'm sure (that) I left my keys on the table.feel sure (that) I feel absolutely sure (that) you've made the right decision.seem sure (that) It now seems sure (that) the election will result in another victory for the government. Shaun isn't sure whether/if he'll be able to come to the party or not.sure of/about Is there anything you're not sure of/about?sure of We arrive early to be sure of getting a good seat. There is only one sure way (= one way that can be trusted) of finding out the truth. See also cocksure informal disapproving certain about something
  • certainI feel certain that this change will be for the best.
  • know/say for certainI can't say for certain, but I think he's coming to the party.
  • sureDon't worry - I'm sure it won't be a problem.
  • positive"Are you sure you let the cat in?" "I'm positive."
See more results » for sure B1 certain or certainly: I know for sure that I won't be able to go to the party. See more be sure of yourself B2 to be very or too confident: She's become much more sure of herself since she got a job. See more be sure of something B2 be confident that something is true: He said that he wasn't completely sure of his facts. See more be sure of/about someone UK (US be sure about someone) to have confidence in and trust someone: Henry has only been working for us for a short while, and we're not really sure about him yet. See more be sure to C1 to be certain to: She's sure to win. See more make sure (that) A2 to look and/or take action to be certain that something happens, is true, etc.: Make sure you lock the door when you go out. See more If you have a sure knowledge or understanding of something, you know or understand it very well: I don't think he has a very sure understanding of the situation.
  • If you don't hear from the builders this week, make sure you chase them up.
  • My wife checks on our elderly neighbour every few days to make sure that he's alright.
  • I'm not sure of the chronology of events.
  • A bit of gentle coaxing is all that's required and he'll come, I'm sure.
  • I'm sure my views on marriage are coloured by my parents' divorce.
Certainty
  • (as) clear as day idiom
  • (as) sure as eggs is eggs idiom
  • and that's flat! idiom
  • assure someone of something
  • assured
  • decidedly
  • deffo
  • definite
  • definitely
  • definitive
  • inviolability
  • inviolable
  • inviolably
  • ironclad
  • irrefutable
  • unquestionably
  • unreserved
  • unreservedly
  • watertight
  • would
See more results »

You can also find related words, phrases, and synonyms in the topics:

Confidence & self-assurance

Idioms

(as) sure as eggs is eggs (as) sure as hell a sure thing sure enough sure thing to be sure sureadverb   informal uk /ʃɔːr/ us /ʃʊr/ A2 certainly: "Do you want to come swimming with us?" "Sure."mainly US "Will you help me with this?" "Sure I will."US I sure am hungry.US "I can't do it!" "Sure you can. I'll help you." US said when someone has thanked you: "Thanks for helping us out." "Sure, any time."
  • Sure I'll help you.
  • 'Are you coming to the park?' ' Sure!'
  • 'Do you fancy a pizza?' 'Sure. Let's ask Andy too.'
Certainty
  • (as) clear as day idiom
  • (as) sure as eggs is eggs idiom
  • and that's flat! idiom
  • assure someone of something
  • assured
  • decidedly
  • deffo
  • definite
  • definitely
  • definitive
  • inviolability
  • inviolable
  • inviolably
  • ironclad
  • irrefutable
  • unquestionably
  • unreserved
  • unreservedly
  • watertight
  • would
See more results »

You can also find related words, phrases, and synonyms in the topics:

Polite expressions (Definition of sure from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

sure | American Dictionary

sureadjective [ -er/-est only ] us /ʃʊər/ Add to word list Add to word list certain; without any doubt: "No more dessert for me, thank you." "Are you sure?" [ + (that) clause ] I’m sure (that) I left my keys on the table. [ + question word ] I’m not sure where they live. If there’s anything you’re not sure of/about, just ask. He said that he wasn’t completely sure of his facts (= not certain that his information was correct). We arrived early, to be sure of getting a good seat. [ + to infinitive ] She’s sure to win. If you are sure of yourself, you are confident: She’s much more sure of herself since she started work.

Idiom

sure enough sureadverb [ -er/-est only ] us /ʃʊr/ certainly: "Do you want to come swimming with us?" "Sure." I sure am hungry (= I am very hungry). (Definition of sure from the Cambridge Academic Content Dictionary © Cambridge University Press)

Examples of sure

sure When the tracker is not sure that a sequence is being repeated, or when the tracked sequence finishes, it returns control to the neural network. From the Cambridge English Corpus To be sure, her strategic name-changes could confuse editors and reviewers. From the Cambridge English Corpus To be sure, the conference tried to clarify things into four strands, each with three sessions of three papers. From the Cambridge English Corpus To be sure, this will require the use of a new set of tasks. From the Cambridge English Corpus To be sure, virtually any work of history or social science invokes some species of causal argument. From the Cambridge English Corpus I am still not sure what kind of tool was used to make these ornaments, but they are not made with the fingertips. From the Cambridge English Corpus There are, to be sure, fewer inscriptions and no very lengthy ones, but that too reflects the relative poverty of public culture. From the Cambridge English Corpus In this world, students asked these types of questions all the time, but none of us were really sure of the answers. From the Cambridge English Corpus Another advantage of depot medication is that staff can be sure that medication has been received by the patient. From the Cambridge English Corpus It seems quite probable that at least some of these are increasing in frequency, though it is difficult to be sure of this. From the Cambridge English Corpus Which definitions are used for measurement may be less important than being sure that the definitions used for evaluation of individual patients are applied consistently. From the Cambridge English Corpus It is shown that the weights are an important factor to make sure the results are realistic. From the Cambridge English Corpus To be sure, the eighteenth-century concept of progress should not be reduced to that ideology. From the Cambridge English Corpus I am sure you will agree that we have enjoyed a most stimulating series of papers during this joint session. From the Cambridge English Corpus The controversy is over the practice of drawing district lines for the purpose of making sure that candidates from under-represented groups get elected. From the Cambridge English Corpus See all examples of sure These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. What is the pronunciation of sure?

Translations of sure

in Chinese (Traditional) 確定的,肯定的,毫無疑問的, 非常清楚的,十分瞭解的, 當然… See more in Chinese (Simplified) 确定的,肯定的,毫无疑问的, 非常清楚的,十分了解的, 当然… See more in Spanish seguro, claro, vale… See more in Portuguese certo, seguro, certamente… See more in Marathi in Japanese in Turkish in French in Catalan in Dutch in Tamil in Hindi in Gujarati in Danish in Swedish in Malay in German in Norwegian in Urdu in Ukrainian in Telugu in Bengali in Czech in Indonesian in Thai in Vietnamese in Polish in Korean in Italian खात्रीचे, निश्चित / ज्याबद्दल शंका नाही असे, नक्की.… See more 確かな, 確信して, いいよ… See more emin, şüphesi olmayan, kuşkusuz… See more sûr/-e, certain/-e, voué/-ée… See more segur, i tant, prou… See more zeker, betrouwbaar… See more நிச்சயம், எந்த சந்தேகமும் இல்லாமல், நிச்சயமாக… See more पक्का, निश्चित, निस्संदेह… See more ખાતરી, ચોક્કસ… See more sikker på, sikker, selvfølgelig(t)!… See more säker, förvissad, [ja]visst!… See more pasti, boleh dipercayai, sudah tentu… See more sicher, gewiss, sicher(lich)… See more sikker, garantert, klart det… See more یقیناً, بلا شبہ, بالکل… See more вірний, безпомилковий, безперечний… See more కచ్చితంగా/పక్కాగా/సందేహము లేకుండా, కచ్చితంగా, శూర్… See more নিশ্চিত, নির্দিষ্ট, সন্দেহাতীত… See more jistý, spolehlivý, ovšem… See more pasti, yakin, tentu saja… See more แน่นอน, มั่นใจ, ที่ไว้ใจได้… See more chắc chắn, có thể tin được, chắc… See more pewny, pewien, niezawodny… See more 확실히, 그럼… See more sicuro, certamente, certo… See more Need a translator?

Get a quick, free translation!

Translator tool

Browse

Surat surcharge surcharged surcharging sure sure enough idiom surefire surefooted surefootedly {{#randomImageQuizHook.filename}} {{#randomImageQuizHook.isQuiz}} Test your vocabulary with our fun image quizzes Try a quiz now {{/randomImageQuizHook.isQuiz}} {{^randomImageQuizHook.isQuiz}} {{/randomImageQuizHook.isQuiz}} {{/randomImageQuizHook.filename}}

More meanings of sure

  • sure thing
  • sure-footed, at surefooted
  • sure-footedly, at surefootedly
  • sure enough idiom
  • for sure phrase
  • for sure idiom
  • make certain/sure phrase
See all meanings
  • sure enough idiom
  • for sure phrase
  • for sure idiom
  • make certain/sure phrase
  • make sure (that) phrase
  • make sure idiom
  • sure thing idiom
See all idioms and phrases

Word of the Day

red-letter day

UK /ˌredˈlet.ə ˌdeɪ/ US /ˌredˈlet̬.ɚ ˌdeɪ/

a special, happy, and important day that you will always remember

About this

Blog

Pondering, musing, and brooding (The language of thinking)

February 11, 2026 Read More

New Words

fricy February 09, 2026 More new words has been added to list To top AI icon AI Assistant Contents EnglishAmericanExamplesTranslations AI icon AI Assistant {{#displayLoginPopup}} Cambridge Dictionary +Plus

Learn more with +Plus

Sign up for free and get access to exclusive content: Free word lists and quizzes from Cambridge Tools to create your own word lists and quizzes Word lists shared by our community of dictionary fans Sign up now or Log in Cambridge Dictionary +Plus

Learn more with +Plus

Create word lists and quizzes for free Sign up now or Log in {{/displayLoginPopup}} {{#displayClassicSurvey}} {{/displayClassicSurvey}}
  • Cambridge Dictionary +Plus
  • My profile
  • +Plus help
  • Log out
AI Assistant Dictionary Definitions Clear explanations of natural written and spoken English English Learner’s Dictionary Essential British English Essential American English Translations Click on the arrows to change the translation direction. Bilingual Dictionaries English–Chinese (Simplified) Chinese (Simplified)–English English–Chinese (Traditional) Chinese (Traditional)–English English–Danish Danish–English English–Dutch Dutch–English English–French French–English English–German German–English English–Indonesian Indonesian–English English–Italian Italian–English English–Japanese Japanese–English English–Norwegian Norwegian–English English–Polish Polish–English English–Portuguese Portuguese–English English–Spanish Spanish–English English–Swedish Swedish–English Semi-bilingual Dictionaries English–Arabic English–Bengali English–Catalan English–Czech English–Gujarati English–Hindi English–Korean English–Malay English–Marathi English–Russian English–Tamil English–Telugu English–Thai English–Turkish English–Ukrainian English–Urdu English–Vietnamese Translate Grammar Thesaurus Pronunciation Cambridge Dictionary +Plus Games {{userName}}
  • Cambridge Dictionary +Plus
  • My profile
  • +Plus help
  • Log out
Log in / Sign up English (UK) Change English (UK) English (US) Español Português 中文 (简体) 正體中文 (繁體) Dansk Deutsch Français Italiano Nederlands Norsk Polski Русский Türkçe Tiếng Việt Svenska Українська 日本語 한국어 ગુજરાતી தமிழ் తెలుగు বাঙ্গালি मराठी हिंदी Follow us Choose a dictionary
  • Recent and Recommended {{#preferredDictionaries}} {{name}} {{/preferredDictionaries}}
  • Definitions Clear explanations of natural written and spoken English English Learner’s Dictionary Essential British English Essential American English
  • Grammar and thesaurus Usage explanations of natural written and spoken English Grammar Thesaurus
  • Pronunciation British and American pronunciations with audio English Pronunciation
  • Translation Click on the arrows to change the translation direction. Bilingual Dictionaries
    • English–Chinese (Simplified) Chinese (Simplified)–English
    • English–Chinese (Traditional) Chinese (Traditional)–English
    • English–Danish Danish–English
    • English–Dutch Dutch–English
    • English–French French–English
    • English–German German–English
    • English–Indonesian Indonesian–English
    • English–Italian Italian–English
    • English–Japanese Japanese–English
    • English–Norwegian Norwegian–English
    • English–Polish Polish–English
    • English–Portuguese Portuguese–English
    • English–Spanish Spanish–English
    • English–Swedish Swedish–English
    Semi-bilingual Dictionaries English–Arabic English–Bengali English–Catalan English–Czech English–Gujarati English–Hindi English–Korean English–Malay English–Marathi English–Russian English–Tamil English–Telugu English–Thai English–Turkish English–Ukrainian English–Urdu English–Vietnamese
  • Dictionary +Plus Word Lists
Choose your language English (UK) English (US) Español Português 中文 (简体) 正體中文 (繁體) Dansk Deutsch Français Italiano Nederlands Norsk Polski Русский Türkçe Tiếng Việt Svenska Українська 日本語 한국어 ગુજરાતી தமிழ் తెలుగు বাঙ্গালি मराठी हिंदी Contents
  • English   
    • Adjective 
      • sure
      • for sure
      • be sure of yourself
      • be sure of something
      • be sure of/about someone
      • be sure to
      • make sure (that)
    Adverb
  • American   AdjectiveAdverb
  • Examples
  • Translations
  • Grammar
  • All translations
My word lists

To add sure to a word list please sign up or log in.

Sign up or Log in My word lists

Add sure to one of your lists below, or create a new one.

{{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

Something went wrong.

{{/message}} {{/verifyErrors}} {{name}} More Go to your word lists {{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

Something went wrong.

{{/message}} {{/verifyErrors}} Tell us about this example sentence: The word in the example sentence does not match the entry word. The sentence contains offensive content. Cancel Submit Thanks! Your feedback will be reviewed. {{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

There was a problem sending your report.

{{/message}} {{/verifyErrors}} The word in the example sentence does not match the entry word. The sentence contains offensive content. Cancel Submit Thanks! Your feedback will be reviewed. {{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

There was a problem sending your report.

{{/message}} {{/verifyErrors}}

Tag » How Do You Spell Sure