67 entries under demanding topic. ×

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, irritating)
3
irritating(adjective, dull, tough, severe, boring)
3
labored(adjective, hard, great, tough, rough)
2
Herculean(adjective, tough, severe, difficult, awkward)
2
awkward(adjective, difficult, heavy, weighty)
2
challenging(adjective, hard, great, tough, severe)
2
stiff(adjective, tough, severe, difficult, painful)
2
superincumbent(difficult, heavy, cruel, troublesome)
1
difficile(adjective, tough, severe, rough, difficult)
1
hairy(adjective, hard, tough, severe, rough)
1
intricate(adjective, tough, severe, difficult, awkward)
1
mean(adjective, hard, rough, difficult, heavy)
1
murder(adjective, hard, great, tough, rough)
1
sticky(adjective, tough, rough, difficult, heavy)
1
terrible(adjective, tough, severe, rough, difficult)
1
testing(adjective, tough, difficult, awkward, grim)
1
unsparing(adjective, tough, rough, difficult, harsh)
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APASmart Define. (2015). onerous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/onerous/thesaurus/synonyms
ChicagoSmart Define. 2015. "onerous thesaurus" https://smartdefine.org/onerous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, onerous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/onerous/thesaurus/synonyms>.
MLASmart Define. "onerous thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/onerous/thesaurus/synonyms>