Englishundoubted
adjective
there has been an undoubted improvement in VDU design:
undisputed, uncontested, unchallenged, unquestioned, not in question, unquestionable, indubitable, not in doubt, incontrovertible, irrefutable, incontestable, unequivocal, sure, certain, obvious, evident, unmistakable, transparent, manifest, patent;
definite, confirmed, accepted, acknowledged, recognized, positive, clear-cut.
▷antonyms doubtful, possible.