54 entries under problematical topic. ×

8
rugged(adjective, hard, tough, severe, rough)
8
tiring(adjective, dull, tough, difficult, awkward)
8
uphill(adjective, great, tough, severe, difficult)
7
effortful(adjective, great, tough, rough, difficult)
6
backbreaking(adjective, hard, difficult, heavy, cruel)
6
distressing(adjective, hard, severe, rough, difficult)
6
knotty(adjective, hard, tough, severe, rough)
6
merciless(adjective, tough, rough, difficult, heavy)
6
operose(adjective, tough, severe, difficulty, difficult)
6
rigorous(adjective, hard, severe, rough, difficult)
6
rough(adjective, hard, great, tough, severe)
6
serious(adjective, hard, tough, severe, rough)
6
wearing(adjective, dull, hard, tough, difficult)
5
complicated(adjective, hard, tough, severe, rough)
5
grueling(adjective, hard, tough, difficult, heavy)
4
tricky(adjective, difficult, awkward, demanding, irritating)
3
labored(adjective, hard, great, tough, rough)
2
Herculean(adjective, tough, severe, difficult, awkward)
2
awkward(adjective, difficult, heavy, demanding, weighty)
2
challenging(adjective, hard, great, tough, severe)
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APASmart Define. (2015). onerous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/onerous/thesaurus/synonyms
ChicagoSmart Define. 2015. "onerous thesaurus" https://smartdefine.org/onerous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, onerous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/onerous/thesaurus/synonyms>.
MLASmart Define. "onerous thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/onerous/thesaurus/synonyms>