Sure definitions

sho͝or, shûr
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.

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Confident, as of something awaited or expected.

I am sure we will win the game.

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Impossible to doubt or dispute; certain.

We have sure proof of his innocence.

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Careful to do something.

Be sure to turn off the stove.

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Free from harm or danger; safe.
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Bound to come about or happen; inevitable.

A sure victory for the team.

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Having one's course directed; destined or bound.

She is sure to succeed.

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Certain not to miss, slip, or err; steady.

A sure grip on the suitcase.

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Not hesitating or wavering; firm.

Sure convictions.

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Worthy of being trusted or depended on; reliable.

A sure friend.

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Free from or marked by freedom from doubt.

She is sure of her friends.

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Surely; certainly.
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Secure or safe.
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That will not fail; always effective.

A sure method.

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That can be relied upon; trustworthy.

A sure friend.

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That cannot be doubted, questioned, or disputed; absolutely true; certain.
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Having or showing no doubt; positive; confident.

To be sure of one's facts.

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That can be counted on to be or happen.

A sure defeat.

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Bound or destined to do, experience, or be something specified.

Sure to be elected.

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Never missing; unerring.

A sure aim.

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Surely; inevitably.
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Certainly; indeed.
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Of course; I understand; OK.
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Physically secure and certain, non-failing, reliable.

This investment is a sure thing. The bailiff had a sure grip on the prisoner's arm.

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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.

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Certain to act or be a specified way.

Be sure to lock the door when you leave.

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Brome.

I presume [...] that you had been sure as fast as faith could bind you, man and wife.

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(modal adverb) Without doubt.

Sure he's coming! Why wouldn't he?

"Did you kill that bear yourself? "•"I sure did!"

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Yes, of course.
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Origin of sure

From Middle English sure, sur, from Middle French sur, from Old French seür, from Latin sÄ“cÅ«rus (“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 Ä¡ewis, Ä¡ewiss (“certain, sure")), Middle English siker (“sure, secure") (from Old English sicor (“secure, sure")).