Sure, certain, positive, cocksure mean having no doubt or uncertainty. Sure usually stresses the subjective or intuitive feeling of assurance. Sure is used to emphasize that something such as a sign or ability is reliable or accurate.
Sure and certain are frequently used interchangeably; Sure, however, is the more subjective term, whereas certain may imply belief based. Sure, certain, confident, positive indicate full belief and trust that something is true.
Sure, certain, and positive are often used interchangeably. Sure, the simplest and most general, expresses mere. Confident, as of something awaited or expected.
Jan 20, 2026this investment is a sure thing. The bailiff had a sure grip on the prisoner's arm. Van ostend's confidence, and i am sure, sure, that by that time he will have something for you that will satisfy even your young ambition.
Free from doubt as to the reliability, character, action, etc., of something. See examples of sure used in a sentence. Being sure has to do with being certain, convinced, trustworthy, or dependable.
You can trust a sure thing.
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