Synonyms:
unquestionable
Meaning: not open to question; "an unquestionable (or unequivocal) loss of prestige"
Synonyms:
authentic, bona_fide, unquestionable, veritable
Meaning: not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring"
Synonyms:
unquestionable
Meaning: incapable of being questioned; "unquestionable authority"
Usage examples
They fixed, by unquestionable tradition, the scene of each memorable event.
I am not certain as to the exact year--the unit of it--though I can with unquestionable certainty record the decade.
Third, there is the question of venereal disease, which society has an unquestionable right to keep down, by every reasonable restriction upon sexual promiscuity.