questionable Synonyms

debatable uncertain doubtful dubitable suspect suspicious refutable iffy disputable dubious borderline unreliable contestable confutable arguable shaky problematical problematic shady risky uncredible spurious unlikely tentative unreputable unsound unstable unassured trustless spotty strange sub judice speculative suspecter sketchy shifty tenuous testable troubling vague worrisome unsettled unprovable unsafe unconvinced unconvincing undependable unreproducible unsubstantiated untrusty