adjective
definite; beyond doubt
Synonyms: absolute, accurate, authentic, bona fide, certain, clear, cold, conclusive, dependable, down pat, downright, established, faultless, flat, flawless, for certain, genuine, incontestable, incontrovertible, indisputable, indubitable, irrefutable, manifest, no ifs ands or buts, obvious, pat, patent, perfect, positive, real, reliable, self-evident, superior, sure, sure-enough, true, undeniable, undisputable, undoubted, unequivocal, unimpeachable, unmistakable, veritable, well-founded, well-grounded
Antonyms: doubtful, indefinite, questionable, uncertain, unsure