260 entries under adjective topic. ×

2
silvery(dull, lead, grim, leaden)
2
solid(set, strong, hard, tough)
2
stable(strong, solid, safe, sheltered)
2
stalwart
2
strapping
2
thick(strong, hard, tough, firm)
2
unchangeable(set, hard, stiff, rigid)
2
unmoved
2
unswerving(determined, resolute, uncompromising, unshakeable)
2
unwavering(determined, resolute, uncompromising, unshakeable)
1
Dove(dull, lead, grim, leaden)
1
adjusted(strong, solid, stable, sure)
1
affectionate
1
anal-retentive(persistent, obstinate, insistent, dogged)
1
anchored(strong, solid, stable, sure)
1
antitypous
1
ash(dull, lead, grim, leaden)
1
battleship(lead, leaden, mousy)
1
beefy
1
bloody-minded(persistent, obstinate, insistent, dogged)
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APASmart Define. (2015). iron thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/iron/thesaurus/synonyms
ChicagoSmart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, iron thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>.
MLASmart Define. "iron thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms>