unquestionable

“unquestionable authority”

Synonyms: incontestable, incontestible
incapable of being contested or disputed; undeniable
not possible to deny; 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

Antonyms:: questionable
subject to question; contestable
capable of being contested; alleged, so-called, supposed
doubtful or suspect; apocryphal
being of questionable authenticity; debatable, problematic, problematical
open to doubt or debate; doubtful, dubious, dubitable, in question
open to doubt or suspicion; equivocal
open to question; fishy, funny, shady, suspect, suspicious
not as expected; impugnable
subject to being discredited; self-styled, soi-disant
as claimed by and for yourself often without justification; show more antonyms...

“an unquestionable antique”

“an unquestionable (or unequivocal) loss of prestige”

Synonyms: unambiguous, unequivocal, univocal
admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion

DEFINITIONS OF: unquestionable