57 entries under severe topic. ×

1
galling(tough, harsh, heavy, painful)
1
gargantuan(strong, tough, powerful, painful)
1
grim(tough, problematic, weighty, trying)
1
hard-won(tough, painful, problematic, trying)
1
immense(tough, painful, problematic, trying)
1
irritating(adjective, dull, tough, boring)
1
merciless(adjective, tough, rough, difficult)
1
murder(adjective, hard, great, tough)
1
no picnic(expression, tough, rough, difficult)
1
problem(tough, painful, problematic, trying)
1
problematic(tough, painful, trying)
1
prohibitive(tough, painful, problematic, trying)
1
rigid(tough, painful, problematic, trying)
1
testing(adjective, tough, difficult, violent)
1
tiresome(adjective, hard, tough, difficult)
1
unyielding(tough, difficult, painful, troubled)
1
upstream(tough, painful, problematic, trying)
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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>