90 entries under involved topic. ×

90
complicated(adjective, upset, hard, simple, difficult)
69
intricate(adjective, hard, simple, difficult, delicate)
59
difficult(adjective, hard, difficult, delicate, awkward)
51
hard(adjective, difficult, tedious, demanding)
50
knotty(adjective, hard, simple, difficult, delicate)
38
compound(noun, adjective, hard, simple, difficult)
37
elaborate(adjective, hard, simple, difficult)
33
labyrinthine(adjective, hard, simple, difficult)
33
composite(noun, adjective, hard, mixed, simple)
32
byzantine(adjective, hard, simple, difficult)
31
tricky(adjective, hard, difficult, delicate, awkward)
30
thorny(adjective, hard, difficult, delicate, awkward)
29
sophisticated(adjective, hard, difficult, dense)
27
Gordian(adjective, hard, difficult, dense)
26
daedal(adjective, hard, simple, difficult)
25
tangled(adjective, hard, simple, difficult, loose)
24
multiple(adjective, hard, difficult, number)
23
multiplex(noun, adjective, hard, difficult)
15
convoluted(adjective, hard, simple, fancy, difficult)
14
puzzling(adjective, hard, fancy, difficult, heavy)
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APASmart Define. (2016). complex thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/complex/thesaurus/synonyms
ChicagoSmart Define. 2016. "complex thesaurus" https://smartdefine.org/complex/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, complex thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/complex/thesaurus/synonyms>.
MLASmart Define. "complex thesaurus" 11 January 2016. Web. 20 September 2026. <https://smartdefine.org/complex/thesaurus/synonyms>