81 entries under firm topic. ×

5
unbreakable(adjective, rigid, unyielding, steely)
5
unfaltering(adjective, strong, resolute, persistent)
5
unflinching(adjective, strong, flat, harsh)
5
unswerving(adjective, strong, tough, determined)
4
hard-boiled(adjective, person, mean, strong, hard)
4
rock-hard(adjective, rigid, unyielding, steely)
4
staunch(adjective, strong, tough, flat)
4
steady(adjective, strong, secure, flat)
3
contumacious(adjective, tough, determined, unreasonable)
3
strong(adjective, hard, tough, flat)
3
ungiving(adjective, stiff, unyielding, militant)
2
bound(adjective, strong, tough, flat)
2
cantankerous(adjective, tough, determined, unreasonable)
2
constant(adjective, strong, secure, flat)
2
dead set on(expression, adjective, idiom, strong, secure)
2
definite(adjective, strong, severe, flat)
2
hard-core(adjective, strong, hard, tough)
2
hard-line(adjective, strong, hard, tough, rough)
2
insubordinate(adjective, tough, unreasonable, grim)
2
purposeful(adjective, deliberate, determined, resolute)
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APASmart Define. (2016). adamant thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/adamant/thesaurus/synonyms
ChicagoSmart Define. 2016. "adamant thesaurus" https://smartdefine.org/adamant/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, adamant thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/adamant/thesaurus/synonyms>.
MLASmart Define. "adamant thesaurus" 23 March 2016. Web. 29 September 2026. <https://smartdefine.org/adamant/thesaurus/synonyms>