Synonyms|251Antonyms|39|Broader|2Narrower|0Related|383

150 entries under adjective topic. ×

7
remorseless(resist, determined, resolute, persistent)
7
unbendable(resist, determined, resolute, persistent)
7
unforgiving(determined, resolute, uncompromising, unshakeable)
6
mulish(strong, hard, tough, firm)
6
pigheaded(tough, determined, resolute, stubborn)
6
stiff-necked(strong, hard, tough, firm)
6
hard-nosed(strong, hard, tough, determined)
6
hardened(strong, firm, determined, stiff)
6
headstrong(determined, resolute, uncompromising, unshakeable)
6
opinionated(determined, resolute, stubborn, uncompromising)
6
steadfast(tough, firm, determined, resolute)
6
strong(set, hard, strength, tough)
6
sturdy(strong, hard, strength, tough)
6
unappeasable(determined, resolute, uncompromising, unshakeable)
5
dogged(tough, firm, determined, resolute)
5
insistent(determined, resolute, uncompromising, unshakeable)
5
ossified(determined, resolute, uncompromising, unshakeable)
5
rigorous(set, strong, hard, tough)
5
unshakable(determined, resolute, uncompromising, unshakeable)
4
bullheaded(strong, hard, tough, severe)
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ChicagoSmart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
MLASmart Define. "adamantine thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms>