57 entries under severe topic. ×

5
stiff(adjective, tough, difficult, painful)
4
mean(adjective, strong, hard, rough)
4
painful(adjective, hard, tough, difficult)
4
rigorous(adjective, hard, tough, rough)
4
serious(adjective, hard, rough, difficult)
3
ambitious(adjective, tough, ability, painful)
3
complicated(adjective, hard, tough, rough)
2
bothersome(adjective, tough, difficult, awkward)
2
challenging(adjective, great, tough, difficult)
2
grinding(adjective, tough, rough, difficult)
2
hairy(adjective, hard, rough, difficult)
2
intricate(adjective, tough, difficult, awkward)
2
not easy(expression, tough, difficult, painful)
2
titanic(tough, painful, problematic, trying)
1
backbreaker(tough, painful, problematic, trying)
1
crucial(tough, painful, problematic, weighty)
1
deep(difficult, intense, weighty, stressful)
1
difficile(adjective, tough, rough, difficult)
1
distressing(adjective, tough, rough, difficult)
1
easier said than done(expression, tough, painful, problematic)
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APASmart Define. (2016). strenuous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/strenuous/thesaurus/synonyms
ChicagoSmart Define. 2016. "strenuous thesaurus" https://smartdefine.org/strenuous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, strenuous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/strenuous/thesaurus/synonyms>.
MLASmart Define. "strenuous thesaurus" 1 April 2016. Web. 25 September 2026. <https://smartdefine.org/strenuous/thesaurus/synonyms>