754 entries under adjective topic. ×

15
strait-laced(tough, correct, severe, firm)
14
demanding(hard, tough, easy, severe)
14
formal(tough, correct, severe, firm)
14
implacable(mean, strong, hard, tough)
14
resolved(severe, harsh, cruel, determined)
14
tenacious(determined, resolute, persistent, obstinate)
14
unswayable(hard, determined, resolute, obstinate)
13
grim(strong, hard, tough, severe)
13
standing pat(determined, resolute, obstinate, uncompromising)
13
unchanging(set, severe, harsh, cruel)
12
dogged(mean, hard, harsh, cruel)
12
hanging tough(expression, mean, hard, determined)
12
intractable(tough, firm, persistent, obstinate)
12
meticulous(hard, correct, severe, rough)
12
mulish(mean, strong, hard, tough)
12
steely(strong, hard, tough, firm)
12
tense(hard, firm, solid, stiff)
12
uncompliant(resist, determined, resolute, obstinate)
11
incompliant(tough, severe, firm, resist)
11
prim(proper, stiff, particular, solemn)
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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>