90 entries under tough topic. ×

2
stiff(adjective, severe, difficult, painful)
2
titanic(severe, painful, problematic, trying)
1
ambitious(hard, severe, difficult, painful)
1
backbreaker(hard, severe, difficult, painful)
1
crucial(severe, painful, problematic, trying)
1
difficile(adjective, severe, rough, difficult)
1
dismaying(hard, great, severe, difficult)
1
easier said than done(expression, severe, painful, problematic)
1
gargantuan(severe, painful, problematic, trying)
1
hairy(adjective, hard, severe, rough)
1
hard-won(severe, painful, problematic, trying)
1
immense(severe, painful, problematic, trying)
1
intricate(adjective, severe, difficult, awkward)
1
murder(adjective, hard, great, rough)
1
no picnic(hard, severe, difficult, painful)
1
not easy(expression, idiom, severe, difficulty)
1
problem(severe, painful, problematic, trying)
1
problematic(severe, painful, trying)
1
prohibitive(severe, painful, problematic, trying)
1
rigid(correct, severe, harsh, proper)
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APASmart Define. (2015). onerous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/onerous/thesaurus/synonyms
ChicagoSmart Define. 2015. "onerous thesaurus" https://smartdefine.org/onerous/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, onerous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/onerous/thesaurus/synonyms>.
MLASmart Define. "onerous thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/onerous/thesaurus/synonyms>