- The definition of sure is someone or something which is certain, trustworthy or always effective.
An example of sure is someone who's positive they're getting a job for which they interviewed.
- Obsolete secure or safe
- that will not fail; always effective: a sure method
- that can be relied upon; trustworthy: a sure friend
- that cannot be doubted, questioned, or disputed; absolutely true; certain
- having or showing no doubt; positive; confident: to be sure of one's facts
- that can be counted on to be or happen: a sure defeat
- bound or destined to do, experience, or be something specified: sure to be elected
- never missing; unerring: a sure aim
Origin of sureOld French seur ; from Classical Latin securus: see secure
to be sure
- Confident, as of something awaited or expected: I am sure we will win the game.
- Impossible to doubt or dispute; certain: We have sure proof of his innocence.
- a. Bound to come about or happen; inevitable: a sure victory for the team.b. Having one's course directed; destined or bound: She is sure to succeed.
- a. Certain not to miss, slip, or err; steady: a sure grip on the suitcase.b. Not hesitating or wavering; firm: sure convictions.
- a. Worthy of being trusted or depended on; reliable: a sure friend.b. Free from or marked by freedom from doubt: She is sure of her friends.
- Careful to do something: Be sure to turn off the stove.
- Obsolete Free from harm or danger; safe.
Origin of sureMiddle English, from Old French, safe, from Latin sēcūrus; see secure.
(comparative surer, superlative surest)
- Physically secure and certain, non-failing, reliable.
- This investment is a sure thing. The bailiff had a sure grip on the prisoner's arm.
- Certain in one's knowledge or belief.
- He was sure she was lying. I am sure of my eventual death. John was acting sure of himself but in truth had doubts.
- Certain to act or be a specified way.
- Be sure to lock the door when you leave.
- I presume […] that you had been sure as fast as faith could bind you, man and wife.
(comparative more sure, superlative most sure)
- Often proscribed in favor of surely. May be informal.
- Yes, of course.
From Middle English sure, sur, from Middle French sur, from Old French seür, from Latin sēcūrus (“secure”, literally “carefree”), from se (“apart”) + cura (“care”) (compare Old English orsorg (“carefree”), from or- (“without”) + sorg (“care”)). See cure. Displaced native Middle English wis, iwis (“certain, sure”) (from Old English ġewis, ġewiss (“certain, sure”)), Middle English siker (“sure, secure”) (from Old English sicor (“secure, sure”)).