123 entries under doubtful topic. ×

6
obscure(adjective, uncertain, vague, dubious)
6
open(adjective, uncertain, unsettled, shaky)
6
unconvincing(adjective, weak, great, flat, poor)
5
ambivalent(adjective, uncertain, vague, hesitant)
5
conjectural(adjective, vague, hesitant, changeable)
5
inconceivable(adjective, extraordinary, amazing, dubious)
5
open to question(expression, adjective, idiom, uncertain)
5
trustless(adjective, uncertain, dishonest, deceitful)
5
unpredictable(adjective, uncertain, vague, hesitant)
4
absurd(adjective, dubious, unbelievable, implausible)
4
chancy(adjective, clear, certain, uncertain)
4
flimsy(adjective, weak, extraordinary, absurd)
4
inconclusive(adjective, clear, weak, certain, uncertain)
4
indistinct(uncertain, shaky, vague, hesitant)
4
misleading(adjective, uncertain, faint, vague)
4
ridiculous(adjective, dubious, absurd, suspicious)
4
speculative(shaky, vague, unsure, imaginary)
4
strange(adjective, unusual, dubious, unexpected)
4
thin(adjective, weak, great, extraordinary, amazing)
4
unconvinced(adjective, uncertain, unsure)
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APASmart Define. (2015). questionable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/questionable/thesaurus/synonyms
ChicagoSmart Define. 2015. "questionable thesaurus" https://smartdefine.org/questionable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, questionable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/questionable/thesaurus/synonyms>.
MLASmart Define. "questionable thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/questionable/thesaurus/synonyms>