117 entries under vague topic. ×

1
irregular(unusual, strange, dubious, changeable)
1
loose(adjective, rough, unknown, unclear)
1
misleading(adjective, uncertain, faint, dubious)
1
on thin ice(expression, adjective, idiom, open, delicate)
1
opaque(uncertain, unclear)
1
putative(uncertain, imaginary, theoretical, supposed)
1
supposed(uncertain, imaginary, theoretical, assumed)
1
suppositious(uncertain, imaginary, theoretical, supposed)
1
tenebrous(uncertain, unclear, ambiguous, misleading)
1
touch and go(expression, adjective, idiom, delicate, uncertain)
1
unexplicit(unclear, ambiguous, misleading, indistinct)
1
unintelligible(dark, uncertain, unclear, ambiguous)
1
unknown(adjective, rough, uncertain, unsettled)
1
up for grabs(expression, adjective, idiom, uncertain)
1
up in the air(expression, adjective, idiom, open, uncertain)
1
waffling(adjective, open, weak, uncertain, unsettled)
0
academic(uncertain, imaginary, theoretical, supposed)
0
amphibological(unclear, ambiguous, misleading, indistinct)
0
assumed(uncertain, imaginary, theoretical, supposed)
0
abstruse(uncertain, unclear)
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APASmart Define. (2016). doubtful thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/doubtful/thesaurus/synonyms
ChicagoSmart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, doubtful thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/doubtful/thesaurus/synonyms>.
MLASmart Define. "doubtful thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/doubtful/thesaurus/synonyms>