1984, Supreme Court of Illinois, opinion in People v Terrell, 459 N.E.2d 1337, quoted in David C. Brody, James R. Acker, and Wayne A. Logan, Criminal Law, Jones & Bartlett Publishers (2001), ISBN 0-8342-1083-5, page 564,
Not likely; improbable; not to be reasonably expected; as, an unlikely event; the thing you mention is very unlikely. Not holding out a prospect of success; likely to fail; unpromising; as, unlikely means.
implies only uncertainty with no suggestion of a moral question a problematic success
strictly suggests only that there is some reason for doubt, but it is often used as a euphemism to imply strong suspicion, almost amounting to certainty, of immorality, dishonesty, etc. a questionable reputation
is less strong, suggesting merely vague suspicion or hesitancy dubious about the future
implies strong uncertainty as to the probability, value, honesty, validity, etc. of something a doubtful remedy
Find another word for doubtful. In this page you can discover 126 synonyms, antonyms, idiomatic expressions, and related words for doubtful, like: unsure, debatable, iffy, yes and no, questionable, indistinct, unclear, dubious, hesitating, confused and skeptical.