Certain

مترادف و متضاد certain

1. adjective confident
   Synonyms: assertive, assured, believing, calm, cocksure, convinced, positive, questionless, sanguine, satisfied, secure, self-confident, sure, unconcerned, undisturbed, undoubtful, undoubting, unperturbed, untroubled
   Antonyms: doubtful, doubting, hesitant, uncertain, unconfident, unsure
2. adjective undoubtable, valid
   Synonyms: absolute, ascertained, authoritative, clear, conclusive, confirmable, definite, demonstrable, destined, determined, establishable, evident, firm, fixed, genuine, guaranteed, having down pat, incontrovertible, indubitable, infallible, in the bag, irrefutable, known, on ice, plain, positive, predestined, provable, real, reliable, safe, salted away, set, sound, supreme, sure, sure thing, true, trustworthy, unambiguous, undeniable, undoubted, unequivocal, unerring, unmistakable, verifiable
   Antonyms: doubtful, dubious, faltering, questionable, uncertain, unreliable, unsure
3. adjective fixed
   Synonyms: assured, bound, certified, concluded, decided, definite, determined, ensured, established, guaranteed, insured, set, settled, stated, stipulated, sure, warranted
   Antonyms: uncertain, undecided, unfixed, unpredictable
4. adjective referring to a specifically known amount
   Synonyms: a couple, a few, defined, divers, express, individual, many, marked, numerous, one, particular, precise, regular, several, singular, some, special, specific, specified, sundry, upwards of, various