undoubted (adjective) undoubted: undisputed
Sinonime: accepted,
assured,
authentic,
certain, doubtless, indisputable,
indubitable,
irrefutable,
obvious,
positive, proven,
sure, unchallenged,
undeniable, unquestionable, unquestioned
Antonime: disputed,
doubtful,
questionable, refuted,
unclear,
unsure