adjective
1.
Synonyms: firm 4, fixed, set, settled, stated, stipulated
Related Word: assured, certified, guaranteed, warranted; ensured, insured, sure
2.
constituting an indeterminate and otherwise unidentified part of a group or whole
certain students dispute this finding
Synonyms: some, various
Related Word: a, an, one; many, numerous; divers, several, sundry
Contrasted words: no; all
3.
being such beyond a doubt
no certain likeness of this saint survives
Synonyms: accurate, authentic, dependable, reliable
Related Word: credible, plausible, well-grounded
Contrasted words: counterfeit, false, spurious; controversial, doubtful, dubious, questionable
Antonyms: uncertain
4.
Synonyms: infallible 2, sure, surefire, unfailing
5.
Synonyms: positive 3, inarguable, incontestable, indisputable, indubitable, sure, uncontestable, uncontrovertible, undeniable, undoubtable
Related Word: confirmable, demonstrable, establishable, provable, verifiable; doubtless, trustworthy, unerring
Contrasted words: controversial, iffy
Antonyms: uncertain
6.
Synonyms: inevitable , ineluctable, ineludible, inescapable, inevasible, necessary, returnless, unavoidable, unescapable, unevadable
Related Word: indefeasible, irrevocable, unalterable, written; fated, predestinated, predetermined
Antonyms: uncertain
7.
Synonyms: sure 5, cocksure, confident, positive
Related Word: assured, confident, sanguine
Contrasted words: hesitant, indecisive, vague, wavering; doubtful, dubious, questionable
Antonyms: uncertain