sure

adjective

/ʃɔːr/

/ʃʊr/

Definition

A2 certain; without any doubt: "What's wrong with him?" "I'm not really sure." I'm sure (that) I left my keys on the table. I feel absolutely sure (that) you've made the right decision. It now seems sure (that) the election will result in another victory for the government. Simon isn't sure whether/if he'll be able to come to the party or not. Is there anything you're not sure of/about? There is only one sure way (= one way that can be trusted) of finding out the truth. → See also cocksureCertaintyConfidence and self-assurance be sure of/about sb › 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. You can always be sure of Kay.Confidence and self-assuranceShowing arrogance and conceit for sure B1 certain or certainly: I know for sure that I won't be able to go to the party. One thing's for sure - once the baby's born, your lives will never be the same again.CertaintyConfidence and self-assurance be sure of yourself B2 to be very or too confident: She's become much more sure of herself since she got a job.Confidence and self-assuranceShowing arrogance and conceit be sure of sth B2 be confident that something is true: He said that he wasn't completely sure of his facts.Confidence and self-assuranceShowing arrogance and conceit be sure of getting/winning sth › to be certain to get or win something: We arrived early, to be sure of getting a good seat. A majority of Congress members wanted to put off an election until they could be sure of winning it.CertaintyConfidence and self-assurance be sure to C1 to be certain to: She's sure to win. I want to go somewhere where we're sure to have good weather.CertaintyConfidence and self-assurance 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 behind you when you go out.CertaintyConfidence and self-assuranceCausing things to happen › 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.Confidence and self-assuranceShowing arrogance and conceit

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