40 entries under hard topic. ×

36
burdensome(adjective, difficult, heavy, complex)
32
tough(adjective, severe, rough, difficult)
29
laborious(adjective, severe, rough, difficult)
28
arduous(adjective, tough, severe, rough)
28
difficult(adjective, tough, rough, harsh)
27
trying(verb, adjective, tough, severe)
26
severe(adjective, tough, difficult, harsh)
25
oppressive(adjective, difficult, heavy, complex)
24
weighty(adjective, difficult, heavy, complex)
23
serious(adjective, difficult, heavy, complex)
21
backbreaking(adjective, difficult, heavy, complex)
21
grievous(adjective, severe, difficult, complex)
21
punishing(adjective, difficult, complex)
21
toilsome(adjective, difficult, complex, laborious)
20
ambitious(adjective, difficult, complex)
20
painful(adjective, difficult, complex)
20
rough(adjective, difficult, heavy, complex)
20
rugged(adjective, difficult, complex, rigorous)
19
demanding(adjective, tough, severe, rough)
19
disturbing(adjective, difficult, complex)
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APASmart Define. (2015). taxing thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/taxing/thesaurus/synonyms
ChicagoSmart Define. 2015. "taxing thesaurus" https://smartdefine.org/taxing/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, taxing thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/taxing/thesaurus/synonyms>.
MLASmart Define. "taxing thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/taxing/thesaurus/synonyms>