238 entries under severe topic. ×

14
demanding(adjective, hard, tough, easy)
14
formal(adjective, tough, correct, firm)
14
resolved(adjective, harsh, cruel, determined)
13
grim(adjective, strong, hard, tough)
13
unchanging(adjective, set, harsh, cruel)
12
meticulous(adjective, hard, correct, rough)
11
incompliant(adjective, tough, firm, resist)
11
scrupulous(adjective, good, hard, complete, tough)
10
flinty(adjective, strong, hard, tough)
10
unmoving(adjective, still, fixed, stiff)
9
stiff-necked(adjective, mean, strong, hard, tough)
9
close(adjective, hard, tough, correct)
9
cool(adjective, cold, detached, unfriendly)
9
definite(adjective, hard, correct, rough)
9
intolerant(adjective, set, plain, straightforward)
9
punctilious(adjective, close, hard, tough, correct)
9
puritanical(adjective, tough, correct, moderate)
9
stuffy(adjective, tough, correct, moderate)
9
undeviating(adjective, harsh, cruel, determined)
8
single-minded(adjective, tough, firm, harsh)
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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>