61 entries under dubious topic. ×

34
obscure(adjective, dull, clear, hard, weak)
32
indistinct(adjective, dull, close, quiet, clear)
26
indefinite(adjective, clear, open, obscure, rough)
18
ambiguous(adjective, clear, open, obscure, rough)
17
uncertain(adjective, clear, open, obscure, rough)
16
indeterminate(adjective, clear, rough, certain, uncertain)
15
cryptic(adjective, obscure, difficult, uncertain, doubtful)
14
opaque(adjective, dull, hard, obscure, flat)
13
equivocal(adjective, clear, open, obscure, rough)
12
enigmatic(adjective, hard, obscure, rough, difficult)
11
doubtful(adjective, clear, open, obscure, rough)
10
clouded(adjective, clear, obscure, certain, uncertain)
10
unsure(adjective, clear, open, rough, certain)
9
unintelligible(adjective, hard, obscure, rough, difficult)
8
unsettled(adjective, clear, open, rough, uncertain)
7
weak(adjective, dull, soft, gentle, dark)
6
questionable(adjective, clear, rough, certain, uncertain)
6
borderline(adjective, clear, open, certain, uncertain)
6
problematic(adjective, clear, rough, certain, uncertain)
6
tenebrous(adjective, obscure, rough, difficult, dark)
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APASmart Define. (2015). unclear thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unclear/thesaurus/synonyms
ChicagoSmart Define. 2015. "unclear thesaurus" https://smartdefine.org/unclear/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unclear thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unclear/thesaurus/synonyms>.
MLASmart Define. "unclear thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/unclear/thesaurus/synonyms>