adjective / adverb / interjection

sure

SHOOR/ʃʊr/

Free from uncertainty or doubt.

The adult points to the completed puzzle, sure every piece fits correctly.

A confident adult points to a clearly completed fitted puzzle, calmly certain all pieces are correct, no writing.

Etymology

From “free from care” or “safe,” sure developed through “reliable” into mental certainty. Being sure thus shifted from being secure against danger to feeling confident that something is true.

In context

Arigato Investorありがとう投資家40:44

going to be very dangerous because who who can say for sure that facebook is going to be around for next 10 years right

Market Crash?!

More examples

This practice is sure to improve your timing.
A rising temperature is a sure sign of trouble.
You sure know how to make people laugh.
"Sure, I'll help you carry those boxes," he says.

Forms

sure · surer · surest

surely adverb — With certainty or a strong expectation.

sureness noun — The state of feeling certain or confident.

Similar words

certain: Emphasizes absence of doubt about facts or outcomes.
confident: Emphasizes trust in abilities or expectations rather than certainty.
reliable: Emphasizes consistent dependability rather than freedom from doubt.