| Adj. | 1. | unquestionable - impossible to question; "unquestionable authority"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"echt, genuine - not fake or counterfeit; "a genuine Picasso"; "genuine leather" | |
| 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" | |