30 entries under heavy topic. ×

4
difficult(adjective, hard, tough, rough)
3
demanding(adjective, tough, severe, rough, difficult)
2
hairy(adjective, tough, rough, difficult)
2
knotty(adjective, tough, rough, difficult)
2
mean(adjective, tough, rough, difficult)
2
rigorous(adjective, tough, rough, difficult)
2
rough(adjective, tough, difficult, awkward)
2
rugged(adjective, tough, rough, difficult)
2
severe(adjective, tough, rough, difficult)
1
backbreaking(adjective, tough, rough, difficult)
1
complicated(adjective, tough, rough, difficult)
1
distressing(adjective, tough, rough, difficult)
1
exhausting(adjective, tough, rough, difficult)
1
fatiguing(adjective, tough, rough, difficult)
1
grinding(adjective, tough, rough, difficult)
1
involved(adjective, tough, rough, difficult)
1
irksome(adjective, tough, rough, difficult)
1
merciless(adjective, tough, rough, difficult)
1
murder(adjective, tough, rough, difficult)
1
scabrous(adjective, tough, rough, difficult)
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APASmart Define. (2015). difficile thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/difficile/thesaurus/synonyms
ChicagoSmart Define. 2015. "difficile thesaurus" https://smartdefine.org/difficile/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, difficile thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/difficile/thesaurus/synonyms>.
MLASmart Define. "difficile thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/difficile/thesaurus/synonyms>