11
pompous(adjective, counterfeit, noble, sham, grand)
11
stony(adjective, hard, firm, careless, indifferent)
11
strait-laced(adjective, informal, restraint, severity, pride)
11
stuffy(adjective, correct, proper, careful, affected)
10
buckram(adjective, hard, firm, dead, rigid)
10
difficult(adjective, hard, tough, severe, rough)
10
dogged(adjective, set, harsh, cruel, determined)
10
extreme(adjective, severe, harsh, extraordinary, cruel)
10
frigid(adjective, cool, cold, detached, unfriendly)
10
headstrong(adjective, hard, severe, rough, harsh)
10
hidebound(adjective, close, firm, restraint, determined)
10
priggish(adjective, characteristic, correct, careful, rigid)
10
resolved(adjective, behaviour, rigid)
10
solemn(adjective, severe, noble, grand, serious)
10
starched(adjective, characteristic, hard, correct, firm)
10
steely(adjective, set, hard, firm, dead)
10
tenacious(adjective, strong, determined, resolute, persistent)
10
thick(adjective, set, hard, tough, rough)
10
ungraceful(adjective, hard, firm, rude, coarse)
10
unswayable(adjective, tough, firm, determined, resolute)
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APASmart Define. (2015). stiff thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stiff thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>.
MLASmart Define. "stiff thesaurus" 24 December 2015. Web. 22 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms>