Word
sure
US/ˈʃʊɹ/
UK/ʃˈɔː/
Definitions
01certain or confident
A1 · Beginner
adj. feeling confident that something is true or will happen.
adj. confident in one's knowledge or belief; convinced of the truth of a statement.
日本語:確か※
“Are you sure that you locked the front door before we left?”
“The witness was absolutely sure of his testimony, refusing to be swayed by the defense attorney's aggressive questioning.”
Pitfall
I am sure for the answer.
I am sure of the answer.
Use 'sure of' or 'sure about' when referring to a noun, or 'sure that' before a clause.
02reliable or steady
B2 · Upper Intermediate
adj. reliable and not likely to fail or fall.
adj. physically secure, reliable, or non-failing in performance.
日本語:確実※
“You need a sure grip when you are climbing these steep rocks.”
“The surgeon's sure hands and calm demeanor reassured the medical staff during the complicated procedure.”
Antonyms
03certainly
A2 · Elementary Informal · American English
adv. used to emphasize that something is definitely true.
adv. used as an intensifier to express certainty or emphasis; often functions as a sentence adverb.
“It sure is hot outside today, isn't it?”
“The new policy sure has caused a lot of confusion among the junior employees this week.”
Synonyms
04yes or of course
A1 · Beginner Informal
interj. a way to say 'yes' or to agree to a request.
interj. used to express agreement, consent, or a positive response to a request.
“"Can I borrow your pen for a second?" "Sure, go ahead."”
“"Would you be willing to review the draft by tomorrow morning?" "Sure, I can fit that into my schedule."”
Antonyms
05you're welcome
A2 · Elementary Informal · American English
interj. a polite way to answer when someone says thank you.
interj. used as a phatic response to an expression of gratitude.
“"Thanks for helping me carry these bags." "Sure, no problem."”
“"I really appreciate you picking me up from the airport." "Sure, it was on my way home anyway."”
Synonyms
Etymology
From Middle English sure, seur, sur, from Middle French sur or Old French seür, from Latin sēcūrus (“secure”, literally “carefree”), from sē- (“apart”) + cūra (“care”) (compare Old English orsorg (“carefree”), from or- (“without”) + sorg (“care”)). See cure. Doublet of secure and the now obsolete or dialectal sicker (“certain, safe”). Displaced native Middle English wis, iwis (“certain, sure”) (from Old English ġewis, ġewiss (“certain, sure”)), as well as Middle English siker (“sure, secure”) (from Old English sicor (“secure, sure”)) with which it was cognate.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
ADJECTIVE
ADVERB
Idioms
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.A1 MoversIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.2.0–3.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 1.0–1.50–23TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.120–224
- Frequency
- Very common
- Level
- A1 · BeginnerOxford
- Updated
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QR code
englishreference.com/q/sure
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「日本語」 data: JMdict (EDRDG), CC BY-SA 4.0