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

75 entries under strong topic. ×

12
iron(adjective, set, hard, tough)
7
hardheaded(adjective, hard, tough, firm)
6
mulish(adjective, hard, tough, firm)
6
stiff-necked(adjective, hard, tough, firm)
6
hard-nosed(adjective, hard, tough, determined)
6
hardened(adjective, firm, determined, stiff)
6
sturdy(adjective, hard, strength, tough)
5
rigorous(adjective, set, hard, tough)
4
bullheaded(adjective, hard, tough, severe)
4
rugged(adjective, set, hard, tough)
4
solid(adjective, set, hard, severe)
3
robust(adjective, hard, strength, tough)
2
dense(adjective, set, hard, tough)
2
durable(adjective, tough, firm, stiff)
2
hard-boiled(adjective, hard, tough, sturdy)
2
hard-core(adjective, hard, tough, sturdy)
2
harsh(adjective, hard, tough, severe)
2
heavy(adjective, hard, tough, sturdy)
2
severe(adjective, hard, tough, harsh)
2
strict(adjective, set, hard, tough)
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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>