Sure (adjective)
Physically secure and certain, non-failing, reliable.
“This investment is a sure thing.”
“The bailiff had a sure grip on the prisoner’s arm.”
Sure (adjective)
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.”
Sure (adjective)
Certain to act or be a specified way.
“Be sure to lock the door when you leave.”
Sure (adjective)
Free from danger; safe; secure.
Sure (adjective)
Betrothed; engaged to marry.
Sure (adverb)
Without doubt, certainly.
“Sure he’s coming! Why wouldn’t he?”
“”Did you kill that bear yourself? ―”I sure did!””
Sure (interjection)
Yes. (Expresses noncommittal agreement or consent.)
“”Do you want me to put this in the garage?” “Sure, go ahead.””
Sure (interjection)
Yes; of course.
“”Could you tell me where the washrooms are?” “Sure, they’re in the corner over there.””
Certain (adjective)
Sure, positive, not doubting.
“I was certain of my decision.”
Certain (adjective)
Determined; resolved.
Certain (adjective)
Not to be doubted or denied; established as a fact.
Certain (adjective)
Actually existing; sure to happen; inevitable.
“Bankruptcy is the certain outcome of your constant gambling and lending.”
Certain (adjective)
Unfailing; infallible.
Certain (adjective)
Fixed or stated; regular; determinate.
Certain (adjective)
Not one”.
Certain (determiner)
Having been determined but not specified. The quality of some particular subject or object which is known by the speaker to have been specifically singled out among similar entities of its class.
“Certain people are good at running.”
Certain (pronoun)
Unnamed or undescribed members (of).
“There were serious objections to certain of the proposals.”
Certain (noun)
Something certain.