61 entries under rigorous topic. ×

34
exacting(adjective, dull, hard, tough, easy)
30
difficult(adjective, dull, hard, tough, severe)
22
hard(adjective, dull, tough, easy, severe)
22
severe(adjective, hard, tough, easy, severe)
21
fussy(adjective, hard, tough, difficult, full)
20
tough(adjective, dull, hard, easy, severe)
18
strict(adjective, hard, tough, easy, severe)
18
critical(adjective, hard, tough, severe, difficult)
17
finicky(adjective, tough, severe, difficult, cross)
15
taxing(adjective, hard, tough, severe, rough)
14
burdensome(adjective, dull, hard, tough, severe)
14
particular(adjective, severe, sharp, unsympathetic, critical)
14
rigid(adjective, hard, tough, easy, severe)
13
arduous(adjective, dull, hard, tough, severe)
13
harsh(adjective, hard, easy, severe, rough)
13
stern(adjective, hard, easy, severe, rough)
12
exigent(adjective, hard, tough, firm, difficult)
12
oppressive(adjective, dull, hard, tough, severe)
11
laborious(adjective, dull, hard, tough, severe)
11
strenuous(adjective, dull, hard, tough, severe)
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APASmart Define. (2015). demanding thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/demanding/thesaurus/synonyms
ChicagoSmart Define. 2015. "demanding thesaurus" https://smartdefine.org/demanding/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, demanding thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/demanding/thesaurus/synonyms>.
MLASmart Define. "demanding thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/demanding/thesaurus/synonyms>