53 entries under tricky 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, involved, demanding)
50
knotty(adjective, hard, simple, difficult, delicate)
40
involved(adjective, hard, simple, bright, difficult)
33
labyrinthine(adjective, hard, simple, difficult, involved)
30
thorny(adjective, hard, difficult, delicate, awkward)
25
tangled(adjective, hard, simple, difficult, loose)
21
problematic(adjective, hard, difficult, delicate, awkward)
21
profound(adjective, hard, difficult, tedious, demanding)
21
trying(adjective, hard, difficult, problematic)
14
puzzling(adjective, hard, fancy, difficult, heavy)
12
perplexing(adjective, hard, fancy, difficult, delicate)
11
obscure(adjective, hard, difficult, delicate, heavy)
10
abstruse(noun, adjective, hard, fancy, difficult)
8
subtle(adjective, hard, delicate, heavy, loose)
7
confusing(adjective, hard, delicate, involved)
7
entangled(adjective, hard, fancy, difficult, involved)
6
delicate(adjective, hard, awkward, complicated)
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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>