Synonyms|393Antonyms|104|Broader|10Narrower|7Related|1.1k

54 entries under heavy topic. ×

9
exigent(adjective, difficult, harsh, demanding)
8
ponderous(adjective, difficult, cumbersome)
8
rugged(adjective, hard, tough, severe, rough)
7
crushing(adjective, difficult, troublesome, arduous)
7
effortful(adjective, great, tough, rough, difficult)
6
backbreaking(adjective, hard, difficult, cruel)
6
distressing(adjective, hard, severe, rough, difficult)
6
knotty(adjective, hard, tough, severe, rough)
6
merciless(adjective, tough, rough, difficult)
6
rigorous(adjective, hard, severe, rough, difficult)
6
rough(adjective, hard, great, tough, severe)
6
serious(adjective, hard, tough, severe, rough)
6
time-consuming(adjective, hard, tough, difficult, slow)
6
tiresome(adjective, hard, severe, difficult)
5
complicated(adjective, hard, tough, severe, rough)
5
galling(adjective, tough, severe, difficult)
5
grueling(adjective, hard, tough, difficult)
2
awkward(adjective, difficult, demanding, weighty)
2
disturbing(adjective, hard, severe, difficult, offensive)
2
superincumbent(difficult, cruel, demanding, troublesome)
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ChicagoSmart Define. 2015. "onerous thesaurus" https://smartdefine.org/onerous/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, onerous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/onerous/thesaurus/synonyms>.
MLASmart Define. "onerous thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/onerous/thesaurus/synonyms>