Thesaurus
certain
adjective
Synonyms and Antonyms of CERTAIN
1
known but not named <a certain person told me that today is your birthday>
Related Words particular, specific
2
having or showing a mind free from doubt <I'm certain that they'll arrive on time>
Related Words self-assured, self-conceited, self-confident; decisive, resolute, unfaltering, unhesitating, unquestioning, unwavering
3
having been established and usually not subject to change <a certain percentage of the profits will go to charity>
Synonyms certain, determinate, final, firm, flat, frozen, hard, hard-and-fast, inexpugnable, set, settled, stable
Related Words nonadjustable, noncancelable, nonnegotiable, unchangeable; constant, steady, unchanging, uniform, unwavering; definite, exact, explicit, specific; given, stated, stipulated; dependable, good, reliable, responsible, safe, solid, sure, tried, tried-and-true, true, trustworthy, trusty
Near Antonyms adjustable, changeable, negotiable; indefinite, open-ended, unspecified; capricious, changeful, flickery, fluctuating, fluid, inconstant, mercurial, mutable, temperamental, uncertain, unpredictable, unsettled, unstable, unsteady, variable, volatile
4
impossible to avoid or evade <as he got older, the athlete began to feel the certain effects of the aging process on his body>
Related Words decided, definite, settled; likely, possible, probable; destined, fated, foreordained, predestined, predetermined, preordained; inexorable, relentless, unremitting, unstoppable
Near Antonyms preventable (also preventible); doubtful, dubious, questionable, shaky, unclear; undecided, unsettled; undependable, unreliable; improbable, unlikely
5
not likely to fail <chicken soup is grandma's certain cure for pretty much whatever ails you>
Antonyms fallible
6
not capable of being challenged or proved wrong <up to this point there's been no certain evidence that a crime has been committed>
Synonyms accomplished, certain, inarguable, incontestable, incontrovertible, indisputable, indubitable, irrefragable, positive, sure, unanswerable, unarguable, unchallengeable, undeniable, unquestionable
Related Words unambiguous, unequivocal; absolute, clear, conclusive, decisive, definite, hands-down; uncontested, uncontradicted, undisputed, unquestioned
Near Antonyms controversial, debated, disputed; doubtful, dubious, iffy, inconclusive, indecisive, uncertain; ambiguous, equivocal; academic (also academical), hypothetical, speculative, theoretical (also theoretic)
Antonyms answerable, arguable, contradictable, controvertible, debatable, disputable, doubtable, moot, negotiable, problematic (also problematical), questionable, refutable
Seen & Heard
What made you want to look up certain? Please tell us where you read or heard it (including the quote, if possible).