40 entries under hard topic. ×

19
operose(adjective, difficult, complex)
19
sad(adjective, difficult, complex)
18
cruel(adjective, difficult, complex)
18
dire(adjective, difficult, complex)
18
unbearable(adjective, difficult, complex)
13
exacting(adjective, tough, severe, rough)
11
onerous(adjective, difficult, harsh, heavy)
9
troublesome(adjective, tough, severe, difficult)
8
exigent(adjective, difficult, harsh, heavy)
7
tiring(adjective, severe, difficult, harsh)
5
exhausting(adjective, severe, difficult, heavy)
5
fatiguing(adjective, tough, severe, difficult)
4
wearing(adjective, tough, difficult, heavy)
3
formidable(adjective, tough, severe, rough)
3
grueling(adjective, severe, difficult, harsh)
3
harsh(adjective, rough, difficult, cruel)
3
uphill(adjective, severe, rough, difficult)
2
stiff(adjective, severe, difficult, harsh)
1
challenging(adjective, tough, difficult, complex)
1
tiresome(adjective, severe, harsh, heavy)
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APASmart Define. (2015). taxing thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/taxing/thesaurus/synonyms
ChicagoSmart Define. 2015. "taxing thesaurus" https://smartdefine.org/taxing/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, taxing thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/taxing/thesaurus/synonyms>.
MLASmart Define. "taxing thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/taxing/thesaurus/synonyms>