| Adj. | 1. | unquestionable - incapable of being questioned; "unquestionable authority" incontestable, incontestible - incapable of being contested or disputed undeniable - not possible to deny questionable - subject to question; "questionable motives"; "a questionable reputation"; "a fire of questionable origin" |
| 2. | unquestionable - not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring" | |
| 3. | unquestionable - not open to question; "an unquestionable (or unequivocal) loss of prestige" unequivocal, univocal, unambiguous - admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion; "unequivocal evidence"; "took an unequivocal position"; "an unequivocal success"; "an unequivocal promise"; "an unequivocal (or univocal) statement" |