32 entries under complex topic. ×

19
involved(adjective, hard, difficult, awkward)
19
knotty(adjective, hard, difficult, awkward)
19
leaden(adjective, hard, difficult)
19
painful(adjective, hard, difficult)
19
rugged(adjective, hard, difficult, awkward)
19
serious(adjective, hard, difficult, awkward)
19
sticky(adjective, hard, difficult, awkward)
19
toilful(adjective, hard, difficult, awkward)
18
grave(adjective, hard, difficult)
18
ponderous(adjective, hard, difficult)
18
profound(adjective, hard, difficult)
18
tricky(adjective, hard, difficult, awkward)
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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>