40 entries under doubtful topic. ×

6
problematic(adjective, open, uncertain, dubious)
5
deep(adjective, hard, evil, heavy, loose)
5
hidden(adjective, cover, hard, evil, obscure)
5
indeterminate(adjective, obscure, uncertain, vague)
5
problematical(adjective, hard, obscure, uncertainty, uncertain)
5
unintelligible(adjective, hard, obscure, rough, difficult)
3
complicated(adjective, hard, evil, obscure, difficult)
3
dubious(uncertain, vague, unclear, tricky)
3
questionable(uncertain, vague, dubious, unclear)
2
concealed(adjective, cover, evil, obscure, difficult)
2
unaccountable(adjective, obscure, solid, vague)
1
arguable(uncertain, dubious, tricky, sticky)
1
debatable(uncertain, dubious, tricky, sticky)
1
disputable(uncertain, dubious, tricky, sticky)
1
dubitable(obscure, uncertain, dubious, tricky)
1
iffy(uncertain, dubious, tricky, sticky)
1
indecisive(obscure, uncertain, dubious, tricky)
1
moot(uncertain, dubious, tricky, sticky)
1
suspect(uncertain, dubious, tricky, sticky)
1
unsettled(uncertain, dubious, unclear, tricky)
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APASmart Define. (2016). enigmatic thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/enigmatic/thesaurus/synonyms
ChicagoSmart Define. 2016. "enigmatic thesaurus" https://smartdefine.org/enigmatic/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, enigmatic thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/enigmatic/thesaurus/synonyms>.
MLASmart Define. "enigmatic thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/enigmatic/thesaurus/synonyms>