140 entries under complex topic. ×

20
involute(adjective, hard, simple, difficult)
20
serious(adjective, hard, difficult, awkward)
20
sticky(adjective, hard, difficult, delicate)
20
tough(adjective, hard, difficult)
19
arduous(adjective, hard, difficult, awkward)
19
backbreaking(adjective, hard, difficult, awkward)
19
composite(adjective, hard, difficult)
19
esoteric(adjective, hard, difficult)
19
grinding(adjective, hard, difficult, awkward)
19
laborious(adjective, hard, difficult, awkward)
19
nasty(adjective, hard, difficult)
19
operose(adjective, hard, difficult, awkward)
19
painful(adjective, hard, difficult)
19
rough(adjective, hard, difficult, awkward)
19
rugged(adjective, hard, difficult, awkward)
19
tangly(adjective, hard, difficult)
19
toilful(adjective, hard, difficult, awkward)
18
tangled(verb, adjective, hard, simple, obscure)
18
anfractuous(adjective, hard, difficult)
18
burdensome(adjective, hard, difficult, awkward)
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APASmart Define. (2015). involved thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/involved/thesaurus/synonyms
ChicagoSmart Define. 2015. "involved thesaurus" https://smartdefine.org/involved/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, involved thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/involved/thesaurus/synonyms>.
MLASmart Define. "involved thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/involved/thesaurus/synonyms>