11 entries under hard topic. ×

34
sinuous(adjective, difficult, complex, straight)
23
labyrinthine(adjective, difficult, complex)
22
intricate(adjective, difficult, complex)
20
complex(adjective, difficult)
20
knotty(adjective, difficult, complex)
19
Byzantine(adjective, difficult, complex)
19
complicated(adjective, difficult, complex)
19
involute(adjective, difficult, complex)
19
involved(adjective, difficult, complex)
18
daedal(adjective, difficult, complex)
18
elaborate(adjective, difficult, complex)
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APASmart Define. (2015). anfractuous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/anfractuous/thesaurus/synonyms
ChicagoSmart Define. 2015. "anfractuous thesaurus" https://smartdefine.org/anfractuous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, anfractuous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/anfractuous/thesaurus/synonyms>.
MLASmart Define. "anfractuous thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/anfractuous/thesaurus/synonyms>