Sure
Certain
Synonyms Certain, convinced, confident, assured, satisfied, easy in one's mind, unhesitating, unfaltering, unshakeable, positive, definite, decided, secure, persuaded, free from doubt, unwavering, unvacillating, and unshaken.
Confident
Synonyms Confident, assured, bound, fated, very likely, certain, with no doubts about, destined, predestined, and nailed on.
Unquestionable
Synonyms Unquestionable, incontestable, incontrovertible, indubitable, beyond doubt, absolute, true, well grounded, proven, decided, evident, clear, final, unmistakable, patent, indisputable, irrefutable, undeniable, beyond question, undoubted, categorical, certain, well founded, settled, obvious, plain, conclusive, definite, and manifest.
Guaranteed
Synonyms Guaranteed, infallible, assured, inevitable, irrevocable, in the bag, reliable, trustworthy, unambiguous, tried and true, foolproof, effective, unfailing, unerring, certain, incontestable, sure-fire, as sure as eggs is eggs, dependable, never-failing, tested, true, established, and efficacious.
Firm
Example Sentences
I'm sure this will work.
Are you sure about that?
She's sure of her decision.
Make sure to call him.
