263 entries under tough topic. ×

19
substantial(adjective, strong, hard, sound)
18
hard-nosed(adjective, mean, clear, strong, hard)
17
inelastic(adjective, hard, firm, solid)
17
mulish(adjective, mean, strong, hard)
17
severe(adjective, appearance, mean, clear, strong)
16
grim(adjective, appearance, mean, strong, hard)
15
steely(adjective, strong, hard, firm)
14
iron(adjective, mean, strong, hard)
14
perverse(adjective, mean, hard, firm)
14
staunch(adjective, clear, strong, sound)
13
bullheaded(adjective, strong, hard, firm)
13
flinty(adjective, strong, hard, severe)
13
harsh(adjective, mean, strong, hard)
13
pigheaded(adjective, mean, hard, firm)
13
solid(adjective, set, strong, hard, sound)
13
stiff-necked(adjective, mean, strong, hard)
12
ruthless(adjective, appearance, mean, strong, hard)
12
unswerving(adjective, strong, firm, determined)
11
incompliant(adjective, firm, resist, determined)
11
pat(adjective, determined, resolute, obstinate)
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APASmart Define. (2016). unyielding thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unyielding/thesaurus/synonyms
ChicagoSmart Define. 2016. "unyielding thesaurus" https://smartdefine.org/unyielding/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, unyielding thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unyielding/thesaurus/synonyms>.
MLASmart Define. "unyielding thesaurus" 10 March 2016. Web. 30 September 2026. <https://smartdefine.org/unyielding/thesaurus/synonyms>