Doubtful, apocryphal, dark, and disreputable are all synonyms for questionable. Certain and indisputable are these antonyms of questionable. And here are another 57 synonyms for questionable.
Questionable Synonyms
1. controversial
- Apocryphal
- Arguable
- Borderline
- Contentious
- Controversial
- Debatable
- Doubtful
- Dubious
- Equivocal
- Iffy
- Implausible
- Improbable
- In dispute
- In doubt
- In question
- Marginal
- Moot
- Not definite
- Not obvious
- Open to doubt
- Open to question
- Problematic
- Problematical
- Spurious
- Uncertain
- Unclear
- Unconvincing
- Undecided
- Unprovable
- Unresolved
- Unsettled
- Unsure
- Unverified
- Dodgy
2. suspicious
- Dark
- Disreputable
- Doubtful
- Dubious
- Fishy
- Funny
- Iffy
- Irregular
- Murky
- Mysterious
- Not quite right
- Odd
- Potentially dishonest
- Potentially illegal
- Shady
- Shifty
- Strange
- Suspect
- Suspicious
- Under suspicion
- Unsavoury
- Dodgy