128 entries under difficult topic. ×

25
laborious(adjective, hard, severe, rough)
24
Gordian(adjective, hard, complex, involved)
24
severe(adjective, hard, violent, complex)
24
toilsome(adjective, hard, complex, awkward)
23
profound(adjective, hard, complex)
22
lumpy(adjective, hard, complex, coarse)
22
trying(adjective, hard, difficulty, complex)
21
burdensome(adjective, hard, complex, awkward)
21
grinding(adjective, hard, complex, awkward)
21
involute(adjective, hard, simple, complex)
21
sensitive(adjective, hard, complex)
20
impossible(adjective, hard, difficulty, complex)
20
inextricable(adjective, hard, complex)
20
nasty(adjective, hard, evil, complex)
20
operose(adjective, hard, severe, rough)
20
oppressive(adjective, hard, complex)
20
painful(adjective, hard, complex)
20
sinuous(adjective, hard, complex)
20
stressful(adjective, hard, complex)
20
tight(adjective, hard, complex)
11 years ago|18k views|share |citing 
APASmart Define. (2015). knotty thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/knotty/thesaurus/synonyms
ChicagoSmart Define. 2015. "knotty thesaurus" https://smartdefine.org/knotty/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, knotty thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/knotty/thesaurus/synonyms>.
MLASmart Define. "knotty thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/knotty/thesaurus/synonyms>