10 entries under hard topic. ×

25
compound(adjective, difficult, complex, various)
23
multiplex(adjective, difficult, complex, diversified)
20
complicated(adjective, difficult, complex, various)
20
complex(adjective, difficult, involved, intricate)
18
intricate(adjective, difficult, complex)
18
involute(adjective, difficult, complex)
17
composite(adjective, difficult, complex)
17
convict(adjective, difficult, complex, bad man)
17
difficult(adjective, complex)
17
involved(adjective, difficult, complex)
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APASmart Define. (2015). multiple thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/multiple/thesaurus/synonyms
ChicagoSmart Define. 2015. "multiple thesaurus" https://smartdefine.org/multiple/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, multiple thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/multiple/thesaurus/synonyms>.
MLASmart Define. "multiple thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/multiple/thesaurus/synonyms>