7
debatable(adjective, uncertain, doubtful, dubious, shady)
6
arguable(adjective, uncertain, doubtful, dubious, questionable)
5
disputable(adjective, uncertain, doubtful, dubious, questionable)
5
doubtful(adjective, uncertain, dubious, questionable, contentious)
5
dubious(adjective, uncertain, doubtful, questionable, contentious)
5
moot(adjective, uncertain, doubtful, dubious, questionable)
5
problematic(adjective, uncertain, doubtful, dubious, shady)
5
questionable(adjective, uncertain, doubtful, dubious, contentious)
5
unresolved(adjective, uncertain, unsettled, vague, settled)
4
suspicious(adjective, uncertain, doubtful, dubious, suspect)
4
uncertain(adjective, doubtful, dubious, questionable, contentious)
3
contestable(adjective, uncertain, doubtful, dubious, questionable)
3
controversial(adjective, uncertain, doubtful, dubious, questionable)
3
in dispute(adjective, uncertain, doubtful, dubious, questionable)
3
in question
3
problematical(adjective, debatable)
3
suspect(adjective, uncertain, doubtful, dubious, shady)
2
conjectural
2
controvertible(adjective, uncertain, doubtful, dubious, contentious)
2
doubtable(adjective, dubious, suspect, shady, contentious)
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APASmart Define. (2015). open to question thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/open_to_question/thesaurus/synonyms
ChicagoSmart Define. 2015. "open to question thesaurus" https://smartdefine.org/open_to_question/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, open to question thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/open_to_question/thesaurus/synonyms>.
MLASmart Define. "open to question thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/open_to_question/thesaurus/synonyms>