dubitable

giving good reason for being doubted, questioned, or challenged some highly dubitable “evidence” that the stone tower was built by the Vikings Synonyms debatable, disputable, dodgy [chiefly British], doubtable, dubious, doubtful, equivocal, fishy, problematic (also problematical), queer, questionable, shady, shaky, suspect, suspiciousRelated Words alleged, so-called, supposed; moot; ambiguous, open, unclear; uncertain, undecided, undetermined; far-fetched, flimsy, improbable, unlikely, weakNear Antonyms decisive, definitive; clear, obvious, open-and-shut, positiveAntonyms certain, hands-down, incontestable, indisputable, indubitable, questionless, sure, undeniable, undoubted, unproblematic, unquestionable