95 entries under difficult topic. ×

43
formidable(adjective, feature, characteristic, tough, severe)
38
herculean(adjective, feature, characteristic, tough, severe)
33
weighty(adjective, tough, severe, harsh)
31
ponderous(adjective, dull, quiet, easy, severe)
23
grievous(adjective, bad, tough, severe)
21
oppressive(adjective, nature, dull, severe, warm)
21
serious(adjective, strong, hard, great, tough)
21
burdensome(adjective, dull, tough, severe)
20
grave(adjective, bad, severe, sad)
15
severe(adjective, strong, hard, tough)
14
profound(adjective, easy, severe, obscure)
13
hard(adjective, person, dull, body, strong)
13
laborious(adjective, dull, hard, tough, severe)
13
onerous(adjective, dull, tough, severe)
13
tedious(adjective, dull, severe, flat)
11
arduous(adjective, dull, tough, severe, rough)
11
clumsy(adjective, characteristic, awkward, stiff)
11
tough(noun, adjective, good, person, dull)
10
abstruse(adjective, easy, severe, obscure)
10
awkward(adjective, big, substantial, high)
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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>