Synonyms|786Antonyms|286|Broader|13Narrower|11Related|3k

123 entries under doubtful topic. ×

11
ambiguous(adjective, clear, rough, certain, uncertain)
11
unsettled(noun, adjective, open, rough, uncertain)
10
fly-by-night(adjective, uncertain, dishonest, deceitful)
10
incredible(adjective, great, flat, poor, extraordinary)
10
unlikely(adjective, open, uncertain, shaky)
9
indefinite(adjective, obscure, rough, uncertain)
9
unbelievable(adjective, weak, great, flat, poor)
9
undecided(noun, adjective, uncertain, unsettled)
9
undependable(adjective, uncertain, dishonest, deceitful)
8
dubitable(adjective, clear, certain, uncertain, anxious)
7
borderline(adjective, clear, certain, uncertain)
7
implausible(adjective, weak, great, flat, poor)
7
in doubt(expression, adjective, idiom, clear, certain)
7
indeterminate(adjective, clear, certain, uncertain)
7
unclear(adjective, clear, rough, certain, uncertain)
7
unresolved(adjective, uncertain, unsettled, vague)
6
doubtable(adjective, uncertain, unsettled, shaky)
6
far-fetched(adjective, extraordinary, uncertain, absurd)
6
indecisive(adjective, clear, certain, uncertain, anxious)
6
mysterious(adjective, unusual, strange, uncertain)
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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>