27 entries under arduous topic. ×

31
laborious(adjective, hard, difficult, heavy, complex)
27
hard(adjective, difficult, heavy, complex, awkward)
26
toilsome(adjective, hard, difficult, complex, awkward)
26
operose(adjective, hard, difficult, complex, awkward)
22
burdensome(adjective, hard, difficult, heavy, cruel)
21
difficult(adjective, hard, heavy, complex, awkward)
19
intricate(adjective, hard, difficult, complex, awkward)
19
knotty(adjective, hard, difficult, complex, awkward)
18
tricky(adjective, hard, difficult, complex, awkward)
9
heavy(adjective, hard, difficult, harsh, heavy)
7
effortful(adjective, hard, severe, rough, difficult)
6
onerous(adjective, hard, difficult, heavy, cruel)
5
strenuous(adjective, strong, hard, rough, difficult)
4
demanding(adjective, hard, difficult, harsh, heavy)
4
exhausting(adjective, hard, severe, rough, difficult)
4
labored(adjective, hard, tough, severe, rough)
3
uphill(adjective, hard, tough, severe, rough)
3
wearisome(adjective, hard, tough, rough, difficult)
2
Herculean(adjective, strong, hard, rough, difficult)
2
irksome(adjective, hard, tough, severe, rough)
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APASmart Define. (2015). backbreaking thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/backbreaking/thesaurus/synonyms
ChicagoSmart Define. 2015. "backbreaking thesaurus" https://smartdefine.org/backbreaking/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, backbreaking thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/backbreaking/thesaurus/synonyms>.
MLASmart Define. "backbreaking thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/backbreaking/thesaurus/synonyms>