275 entries under adjective topic. ×

12
agonizing(painful, sickness, ache, anguishes)
12
steep(sharp, course, extreme, quick)
10
aching(painful, sickness, ache, anguishes)
10
exacting(dull, hard, tough, severe)
10
excruciating(painful, sickness, ache, anguishes)
10
piercing(painful, sickness, ache, anguishes)
10
uncomfortable(painful, sickness, ache, anguishes)
10
wearying(dull, difficult, awkward, boring)
9
biting(painful, sickness, ache, anguishes)
9
rigorous(hard, tough, severe, rough)
9
throbbing(painful, sickness, ache, anguishes)
9
unpleasant(difficult, harsh, tender, cruel)
9
wearisome(dull, tough, severe, difficult)
8
stiff(hard, tough, severe, rough)
8
tormenting(painful, sickness, ache, anguishes)
7
effortful(hard, great, tough, rough)
7
harrowing(hard, severe, difficult, tender)
7
hurtful(painful, sickness, ache, anguishes)
7
terrible(difficult, tender, awkward, raw)
6
abrupt(sharp, course, quick, rash)
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APASmart Define. (2016). arduous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/arduous/thesaurus/synonyms
ChicagoSmart Define. 2016. "arduous thesaurus" https://smartdefine.org/arduous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, arduous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/arduous/thesaurus/synonyms>.
MLASmart Define. "arduous thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/arduous/thesaurus/synonyms>