94 entries under severe topic. ×

6
distressing(adjective, hard, rough, difficult)
6
knotty(adjective, hard, tough, rough)
6
operose(adjective, tough, difficulty, difficult)
6
rigorous(adjective, hard, rough, difficult)
6
rough(adjective, hard, great, tough)
6
serious(adjective, hard, tough, rough)
6
tiresome(adjective, hard, difficult, heavy)
5
complicated(adjective, hard, tough, rough)
5
galling(adjective, tough, difficult, heavy)
4
inconvenient(adjective, hard, offensive, distressing)
3
irritating(adjective, dull, tough, boring)
3
rigourous
2
Herculean(adjective, tough, difficult, awkward)
2
challenging(adjective, hard, great, tough)
2
disturbing(adjective, hard, difficult, offensive)
2
impeding(hard, offensive, distressing, upsetting)
2
stiff(adjective, tough, difficult, painful)
2
titanic(tough, painful, problematic, trying)
2
troubling(hard, offensive, distressing, upsetting)
2
upsetting(adjective, hard, offensive, awful)
11 years ago|15k views|share |citing 
APASmart Define. (2015). onerous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/onerous/thesaurus/synonyms
ChicagoSmart Define. 2015. "onerous thesaurus" https://smartdefine.org/onerous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, onerous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/onerous/thesaurus/synonyms>.
MLASmart Define. "onerous thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/onerous/thesaurus/synonyms>