Synonyms|127Antonyms|52|Broader|0Narrower|0Related|569

47 entries under strong topic. ×

30
indestructible(adjective, tough, firm, rigid)
23
tough(adjective, firm, solid, stiff)
20
adamantine(adjective, tough, severe, firm)
18
flinty(adjective, hard, firm, solid)
13
shatterproof(adjective, tough)
9
infrangible(adjective, tough)
9
unyielding(adjective, hard, tough, severe)
8
rigid(adjective, hard, severe, firm)
6
firm(adjective, hard, tough, severe)
5
solid(adjective, hard, tough, severe)
5
hard(adjective, severe, firm, harsh)
5
resistant(adjective, hard, tough, solid)
5
rugged(adjective, tough)
5
tight(adjective, hard, tough, solid)
4
everlasting(adjective, tough)
4
durable(adjective, hard, tough, firm)
4
lasting(adjective, tough)
4
unshakable(adjective, tough)
2
armored(adjective, tough)
2
brass-bound(adjective, tough)
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ChicagoSmart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, unbreakable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>.
MLASmart Define. "unbreakable thesaurus" 5 January 2016. Web. 24 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms>