55 entries under grim topic. ×

14
obdurate(adjective, strong, hard, tough, severe)
12
unrelenting(adjective, mean, strong, hard, tough)
11
intransigent(adjective, firm, deliberate, determined, unreasonable)
11
uncompromising(adjective, mean, hard, severe, deliberate)
10
pigheaded(adjective, mean, hard, tough, resist)
10
relentless(adjective, mean, strong, hard, tough)
10
unbending(adjective, mean, strong, hard, tough)
9
dogged(adjective, mean, hard, tough, firm)
8
adamant(adjective, mean, strong, hard, tough)
8
bullheaded(adjective, strong, hard, tough, firm)
8
inexorable(adjective, mean, strong, hard, tough)
8
mulish(adjective, mean, strong, hard, tough)
8
perverse(adjective, mean, hard, tough, resist)
7
hardheaded(adjective, strong, hard, tough, resist)
7
adamantine(adjective, strong, hard, tough, firm)
7
implacable(adjective, mean, strong, hard, tough)
6
intractable(adjective, tough, firm, stupid, unreasonable)
6
tenacious(adjective, tough, firm, resist, unreasonable)
4
firm(adjective, mean, strong, hard, tough)
4
refractory(adjective, tough, firm, determined, unreasonable)
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APASmart Define. (2015). stiff-necked thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/stiff-necked/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiff-necked thesaurus" https://smartdefine.org/stiff-necked/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, stiff-necked thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/stiff-necked/thesaurus/synonyms>.
MLASmart Define. "stiff-necked thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/stiff-necked/thesaurus/synonyms>