1 impossible to question; "unquestionable authority" [ant: questionable]
2 not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring" [syn: authentic, bona fide, veritable]
3 not open to question; "an unquestionable (or unequivocal) loss of prestige"
- Finnish: kiistämätön
- French: indiscutable
- German: fraglos, unzweifelhaft
- Portuguese: inquestionável
absolute, actual, admitting no question, ascertained, attested, authenticated, believable, bona fide, categorically true, certain, certified, clear, colorable, conceivable, conclusive, confirmable, confirmed, corroborated, credible, deep-seated, definite, demonstrable, demonstratable, demonstrated, dependable, determined, documentary, effectual, esoteric, established, factual, fiduciary, flat, genuine, historical, immanent, implanted, implicit, inalienable, inappealable, incontestable, incontrovertible, indisputable, indubitable, indwelling, infixed, ingrained, inherent, inner, internal, intrinsic, inward, inwrought, irreducible, irrefragable, irrefutable, manifest, not in error, objectively true, obvious, patent, plausible, positive, private, provable, proved, real, reliable, resident, secret, self-evident, subjective, substantiated, sure, sure-enough, tenable, testable, true, true as gospel, trustworthy, trusty, truthful, unalienable, unanswerable, unchallengeable, unconfutable, unconfuted, uncontestable, undeniable, undenied, undoubted, unequivocal, unerroneous, unexceptionable, unfallacious, unfalse, unimpeachable, unmistakable, unmistaken, unrefutable, unrefuted, up-and-down, validated, veracious, verifiable, verified, veritable, very, well-founded, well-grounded, worthy of faith