95 entries under difficult topic. ×

10
grueling(adjective, hard, tough, severe)
10
labored(adjective, tough, severe, awkward)
10
recondite(adjective, easy, severe, obscure)
9
backbreaking(adjective, hard, harsh, cruel)
9
operose(adjective, tough, severe, rough)
9
rough(noun, adjective, calm, strong, hard)
9
solemn(adjective, quiet, severe, sad)
9
tiresome(adjective, dull, tough, flat)
9
toilsome(adjective, tough, severe, harsh)
9
troublesome(adjective, tough, severe, harsh)
8
distressing(adjective, tough, severe, rough)
8
esoteric(adjective, easy, severe, obscure)
7
effortful(adjective, tough, severe, harsh)
7
harsh(adjective, strong, hard, tough, severe)
7
intolerable(adjective, severe)
7
rugged(adjective, calm, strong, hard, sound)
7
strenuous(adjective, dull, tough, severe, rough)
7
violent(adjective, calm, severe, rough)
7
wearisome(adjective, dull, tough, severe)
6
painful(adjective, hard, tough, severe)
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APASmart Define. (2016). heavy thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/heavy/thesaurus/synonyms
ChicagoSmart Define. 2016. "heavy thesaurus" https://smartdefine.org/heavy/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, heavy thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/heavy/thesaurus/synonyms>.
MLASmart Define. "heavy thesaurus" 25 January 2016. Web. 23 September 2026. <https://smartdefine.org/heavy/thesaurus/synonyms>