adjective
1.
Synonyms: positive 3, certain, incontestable, indisputable, irrefutable, sure, uncontestable, uncontrovertible, undeniable, unquestionable
Antonyms: dubitable, questionable
2.
Synonyms: authentic 2, blown-in-the-bottle, bona fide, genuine, real, sure-enough, true, undoubted, unquestionable, veritable
Antonyms: doubtful, dubious
3.
Synonyms: downright 2, flat, unquestionable, up-and-down