Determined, accepted, assured, defined, and definite are all synonyms for certain. Unthinkable, doubtful, possible, unlikely, and unreliable are antonyms of certain. And here are 101 another word for certain.
Accepted, acknowledged, as sure as eggs is eggs, assured of doing something, assured, automatic, beyond doubt, beyond question, bound to happen, bound, clear, conclusive, confirmed, definite, dependable, destined, effective, efficacious, evident, fated, foolproof, guaranteed, in the bag, incontestable, incontrovertible, indisputable, indubitable, ineluctable, inescapable, inevitable, inexorable, infallible, irrefutable, manifest, nailed on, necessary, not in doubt, not in question, obvious, out of one's hands, palpable, patent, plain, predestined, predictable, recognized, reliable, sound, sure to happen, sure-fire, sure, tested, there are no two ways about it, transparent, tried and tested, trusted, trustworthy, unavoidable, unchallenged, uncontested, undeniable, undisputed, undoubted, unequivocal, unerring, unfailing, unmistakable, unpreventable, unquestionable, unquestioned, very likely, and sovereign are all synonyms for certain.
Assured, confident, convinced, easy in one's mind, have no doubt, in no doubt, not question, persuaded, positive, satisfied, secure in one's belief, sure, unshaken in one's belief, and hold the unwavering view are all another word for certain.
Defined, definite, determined, established, exact, explicit, express, fixed, individual, particular, precise, special, specific, and especial are all synonyms for certain.
Certain synonym page has a variety of synonyms that differ in length. 2 synonyms with 4, 6, and 18 letters and 7 synonyms with 5 letters. 9 synonyms with 7 letters and 14 synonyms with 8, and 10 letters.
12 synonyms with 9 letters and 16 synonyms with 11 letters. 6 synonyms with 12 letters and 4 synonyms with 13 letters. 5 synonyms with 14 letters and 1 synonym with 16, 20, 23, and 24 letters. For a total of 97 another word for certain.
I am certain about this.
She is certain of success.
He felt certain of victory.
We are certain it's true.