108 entries under tough topic. ×

50
severe(adjective, characteristic, strong, hard)
49
rigorous(adjective, feature, strong, hard)
38
rigid(adjective, characteristic, good, strong, hard)
33
harsh(adjective, characteristic, strong, hard)
33
stern(adjective, characteristic, hard, easy)
25
exacting(adjective, characteristic, hard, easy)
22
stringent(adjective, hard, severe, rough)
22
austere(adjective, characteristic, strong, hard)
19
demanding(adjective, characteristic, hard, easy)
19
hard(adjective, strong, easy, severe)
19
inflexible(adjective, characteristic, strong, hard)
17
uncompromising(adjective, hard, severe, rough)
15
firm(noun, adjective, close, strong, hard)
14
critical(adjective, hard, severe, sharp)
12
unyielding(adjective, strong, hard, easy)
11
oppressive(adjective, hard, severe, rough)
10
relentless(adjective, strong, hard, severe)
10
unbending(adjective, strong, hard, severe)
9
authoritarian(adjective, strong, hard, severe)
9
dour(adjective, severe, firm, harsh)
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APASmart Define. (2015). strict thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/strict/thesaurus/synonyms
ChicagoSmart Define. 2015. "strict thesaurus" https://smartdefine.org/strict/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, strict thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/strict/thesaurus/synonyms>.
MLASmart Define. "strict thesaurus" 3 August 2015. Web. 26 September 2026. <https://smartdefine.org/strict/thesaurus/synonyms>