Synonyms of questionable in English:


See definition of questionable


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

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

certain, indisputable

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

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