5
irritating(adjective, dull, tough, severe, boring)
5
labored(adjective, hard, great, tough, rough)
5
smarting(adjective, tender, raw, painful, burning)
5
stinging(adjective, tender, raw, painful, burning)
5
straining
5
tedious(adjective, dull, difficult, tender, boring)
5
wearing(adjective, dull, hard, tough, difficult)
4
awkward(adjective, difficult, demanding, problematic, grueling)
4
bothersome(adjective, hard, tough, severe, difficult)
4
challenging(adjective, hard, great, tough, severe)
4
cumbersome(adjective, difficult)
4
disagreeable(adjective, tender, raw, painful, burning)
4
irksome(adjective, dull, difficulty, difficult, heavy)
4
murderous(adjective, difficult)
4
precipitous(adjective, sharp, course, quick, rash)
4
saddening(adjective, sickness, ache, anguishes)
4
titanic(tough, severe, painful, problematic, trying)
4
torturing(adjective, painful)
4
wrenching(adjective, painful)
3
acute(adjective, painful)
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APASmart Define. (2016). arduous thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/arduous/thesaurus/synonyms
ChicagoSmart Define. 2016. "arduous thesaurus" https://smartdefine.org/arduous/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, arduous thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/arduous/thesaurus/synonyms>.
MLASmart Define. "arduous thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/arduous/thesaurus/synonyms>