72 entries under difficult topic. ×

19
knotty(adjective, hard, complex, awkward)
19
leaden(adjective, hard, complex)
19
painful(adjective, hard, complex)
19
rugged(adjective, hard, complex, awkward)
19
serious(adjective, hard, complex, awkward)
19
sticky(adjective, hard, complex, awkward)
19
toilful(adjective, hard, complex, awkward)
18
grave(adjective, hard, complex)
18
ponderous(adjective, hard, complex)
18
profound(adjective, hard, complex)
18
tricky(adjective, hard, complex, awkward)
10
grueling(adjective, hard, tough, severe)
9
heavy(adjective, hard, harsh, heavy)
7
effortful(adjective, hard, severe, rough)
6
onerous(adjective, hard, heavy, cruel)
5
strenuous(adjective, strong, hard, rough)
4
demanding(adjective, hard, harsh, heavy)
4
exacting(adjective, hard, harsh, heavy)
4
exhausting(adjective, hard, severe, rough)
4
labored(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>