73 entries under strenuous topic. ×

30
difficult(adjective, dull, hard, tough, severe)
20
tough(adjective, dull, hard, easy, severe)
15
taxing(adjective, hard, tough, severe, rough)
14
burdensome(adjective, dull, hard, tough, severe)
13
arduous(adjective, dull, hard, tough, severe)
12
exigent(adjective, hard, tough, firm, difficult)
12
oppressive(adjective, dull, hard, tough, severe)
11
laborious(adjective, dull, hard, tough, severe)
11
onerous(adjective, dull, hard, tough, severe)
11
troublesome(adjective, hard, tough, severe, difficult)
10
trying(adjective, dull, hard, tough, severe)
8
toilsome(adjective, hard, tough, severe, difficult)
7
challenging(verb, adjective, hard, tough, severe)
5
knotty(adjective, hard, tough, severe, rough)
5
tricky(adjective, tough, difficult, awkward, painful)
5
uphill(adjective, hard, tough, severe, rough)
4
effortful(adjective, tough, severe, difficult, harsh)
4
exhausting(adjective, dull, hard, tough, difficult)
4
heavy(adjective, dull, tough, severe, rough)
4
mean(adjective, hard, severe, rough, difficult)
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APASmart Define. (2015). demanding thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/demanding/thesaurus/synonyms
ChicagoSmart Define. 2015. "demanding thesaurus" https://smartdefine.org/demanding/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, demanding thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/demanding/thesaurus/synonyms>.
MLASmart Define. "demanding thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/demanding/thesaurus/synonyms>