1
gloomy(hard, severe, offensive, cruel, distressing)
1
hairy(adjective, hard, tough, severe, rough)
1
hampering
1
hard-earned
1
hard-fought
1
hard-won(tough, severe, painful, problematic, trying)
1
hardly
1
headache(adjective, difficult, heavy, cruel, arduous)
1
heartbreaking
1
heavy-handed
1
ho-hum(adjective, dull, boring, tired, tedious)
1
humdrum(adjective, dull, boring, tedious, irritating)
1
immense(tough, severe, painful, problematic, trying)
1
impedimental
1
impeditive
1
incumbent
1
insistent
1
intricate(adjective, tough, severe, difficult, awkward)
1
ironhanded(correct, proper, cruel, rigid, domineering)
1
jading(adjective, dull, boring, tired, tedious)
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APASmart Define. (2015). onerous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/onerous/thesaurus/synonyms
ChicagoSmart Define. 2015. "onerous thesaurus" https://smartdefine.org/onerous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, onerous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/onerous/thesaurus/synonyms>.
MLASmart Define. "onerous thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/onerous/thesaurus/synonyms>