128 entries under difficult topic. ×

3
dense(adjective, complex, involved, complicated)
3
harsh(adjective, hard, rough, coarse)
3
heavy(adjective, hard, tough, severe, rough)
3
wearing(adjective, tough, rough, heavy)
2
Daedalean(adjective, hard, fancy, obscure)
2
bothersome(adjective, tough, rough, heavy)
2
cryptic(adjective, evil, obscure, sophisticated)
2
cumbersome
2
difficile(adjective, tough, rough, heavy)
2
exacting(adjective, hard, tough, severe, rough)
2
fancy(adjective, hard, exact, complex)
2
fussy(adjective, fancy, exact, complex)
2
mean(adjective, hard, tough, severe, rough)
2
rigorous(adjective, tough, severe, rough)
2
slavish(adjective, tough, rough, heavy)
2
wearisome(adjective, hard, tough, severe, rough)
2
wicked(adjective, hard, severe, evil)
1
adverse
1
can of worms(expression, adjective, idiom, hard, fancy)
1
cantankerous
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APASmart Define. (2015). knotty thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/knotty/thesaurus/synonyms
ChicagoSmart Define. 2015. "knotty thesaurus" https://smartdefine.org/knotty/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, knotty thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/knotty/thesaurus/synonyms>.
MLASmart Define. "knotty thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/knotty/thesaurus/synonyms>