Synonyms of questionable in English:

questionable


See definition of questionable

adjective

1‘it is questionable whether such an attack could be effective’

SYNONYMS

controversial, contentious, open to question, open to doubt, in doubt, doubtful, dubious, uncertain, unsure, debatable, in dispute, in question, arguable, problematic, problematical

unverified, unprovable, unresolved, unsettled, undecided, equivocal, unconvincing, implausible, improbable, not definite, unclear, not obvious, apocryphal, spurious, borderline, marginal, moot

informal iffy

British informal dodgy

ANTONYMS

certain, indisputable

2‘some of his questionable financial dealings have been investigated’

SYNONYMS

suspicious, suspect, under suspicion, irregular, dubious, doubtful, odd, queer, strange, not quite right, mysterious, murky, dark, shifty, unsavoury, disreputable, potentially dishonest, potentially illegal

informal funny, fishy, shady, iffy

British informal dodgy