120 entries under harsh topic. ×

25
hard-nosed(adjective, mean, strong, hard, tough)
22
tough(adjective, mean, strong, hard, easy)
20
austere(adjective, strong, hard, tough, severe)
19
exacting(adjective, hard, tough, easy, severe)
18
stringent(adjective, hard, tough, severe, rough)
15
precise(adjective, hard, correct, severe, rough)
15
strait-laced(adjective, tough, correct, severe, firm)
14
demanding(adjective, hard, tough, easy, severe)
14
implacable(adjective, mean, strong, hard, tough)
14
resolved(adjective, severe, cruel, determined)
13
grim(adjective, strong, hard, tough, severe)
13
unchanging(adjective, set, severe, cruel)
12
dogged(adjective, mean, hard, cruel)
11
scrupulous(adjective, good, hard, complete, tough)
10
flinty(adjective, strong, hard, tough, severe)
10
remorseless(adjective, resist, cruel, determined)
9
careful(adjective, close, correct, solid)
9
close(adjective, hard, tough, correct, severe)
9
punctilious(adjective, close, hard, tough, correct)
9
puritanical(adjective, tough, correct, moderate, severe)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>