questionable
/ˈkwɛst͡ʃənəbl̩/
Proposed by a contributor, not yet supported by evidence.
Sense 1
Meaning · English
Problematic; open to doubt or challenge.
Adjective
Examples
It is questionable if the universe is open or closed.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
Of dubious respectability or morality.
Adjective
Examples
[…] he had a love of money—a sort of acquisitiveness, that led him into questionable dealings.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “questionable” mean?
Problematic; open to doubt or challenge.
Is “questionable” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.