11
scrupulous(adjective, good, hard, complete, tough)
11
unchangeable(adjective, set, hard, regular, fixed)
10
bigoted(adjective, determined, resolute, obstinate, uncompromising)
10
flinty(adjective, strong, hard, tough, severe)
10
remorseless(adjective, harsh, resist, cruel, determined)
10
unmoving(adjective, severe, still, fixed, stiff)
10
unshakeable(adjective, determined, resolute, uncompromising)
10
unswerving(adjective, complete, total, intense, determined)
9
stiff-necked(adjective, mean, strong, hard, tough)
9
careful(adjective, close, correct, harsh, solid)
9
close(adjective, hard, tough, correct, severe)
9
conscientious(adjective, good, honest, fair, pure)
9
contrary(adjective, determined, resolute, persistent, obstinate)
9
cool(adjective, severe, cold, detached, unfriendly)
9
definite(adjective, hard, correct, severe, rough)
9
die-hard(adjective, resist, determined, resolute, persistent)
9
intolerant(adjective, set, severe, plain, straightforward)
9
narrow
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 22, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 22 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>