18 entries under difficult topic. ×

5
equivocal(adjective, obscure, rough, dark)
4
tenebrous(adjective, obscure, rough, dark)
4
vague(adjective, clear, obscure, rough)
3
enigmatic(adjective, obscure, rough, uncertain)
3
obscure(adjective, rough, dark, uncertain)
3
uncertain(adjective, obscure, rough, dark)
3
unclear(adjective, obscure, rough, dark)
2
unintelligible(adjective, obscure, rough, uncertain)
1
cryptic(adjective, obscure, uncertain, unclear)
1
perplexing(adjective, obscure, rough, uncertain)
0
abstruse(adjective, obscure, uncertain, unclear)
0
arcane(adjective, obscure, uncertain, unclear)
0
baffling(adjective, obscure, uncertain, unclear)
0
concealed(adjective, obscure, uncertain, unclear)
0
imperceptive(adjective, obscure, uncertain, unclear)
0
incomprehensible(adjective, obscure, uncertain, unclear)
0
purblind(adjective, obscure, uncertain, unclear)
0
unfathomable(adjective, obscure, uncertain, unclear)
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APASmart Define. (2015). amphibological thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/amphibological/thesaurus/synonyms
ChicagoSmart Define. 2015. "amphibological thesaurus" https://smartdefine.org/amphibological/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, amphibological thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/amphibological/thesaurus/synonyms>.
MLASmart Define. "amphibological thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/amphibological/thesaurus/synonyms>