123 entries under strict topic. ×

15
strait-laced(adjective, tough, correct, severe, firm)
14
demanding(adjective, hard, tough, easy, severe)
14
formal(adjective, tough, correct, severe, firm)
14
implacable(adjective, mean, strong, hard, tough)
14
resolved(adjective, severe, harsh, cruel, determined)
13
grim(adjective, strong, hard, tough, severe)
13
unchanging(adjective, set, severe, harsh, cruel)
12
dogged(adjective, mean, hard, harsh, cruel)
12
steely(adjective, strong, hard, tough, firm)
11
incompliant(adjective, tough, severe, firm, resist)
11
unchangeable(adjective, set, hard, regular, fixed)
10
flinty(adjective, strong, hard, tough, severe)
10
unmoving(adjective, severe, still, fixed, stiff)
9
careful(adjective, close, correct, harsh, solid)
9
close(adjective, hard, tough, correct, severe)
9
definite(adjective, hard, correct, severe, rough)
9
undeviating(adjective, severe, harsh, cruel, determined)
8
single-minded(adjective, tough, severe, firm, harsh)
8
static(adjective, set, secure, severe, still)
7
cruel(adjective, strong, hard, tough, severe)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 24 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>