unquestionable

1. Incapable of being questioned (synset 301924583)
   "unquestionable authority"
   also:

   • incontestable, incontestible - incapable of being contested or disputed
   • undeniable - not possible to deny
   similar to:

   • acknowledged - generally accepted
   • beyond doubt, indubitable - too obvious to be doubted
   • for sure - not open to doubt
   • mathematical - beyond question
   • unimpeachable - beyond doubt or reproach
2. Not counterfeit or copied (synset 301119377)
   "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring"
   similar to: echt, genuine - not fake or counterfeit
   same as: authentic, bona fide, veritable
3. Not open to question (synset 300900656)
   "an unquestionable (or unequivocal) loss of prestige"
   similar to: unambiguous, unequivocal, univocal - admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion

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