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

21 entries under tough topic. ×

30
indestructible(adjective, strong, firm, rigid)
20
adamantine(adjective, strong, severe, firm)
13
shatterproof(adjective, strong)
9
infrangible(adjective, strong)
9
unyielding(adjective, strong, hard, severe)
6
firm(adjective, strong, hard, severe)
5
solid(adjective, strong, hard, severe)
5
resistant(adjective, strong, hard, solid)
5
rugged(adjective, strong)
5
tight(adjective, strong, hard, solid)
4
everlasting(adjective, strong)
4
durable(adjective, strong, hard, firm)
4
lasting(adjective, strong)
4
unshakable(adjective, strong)
2
armored(adjective, strong)
2
brass-bound(adjective, strong)
2
nonbreakable(adjective, strong)
2
toughened(adjective, strong)
1
incorruptible(adjective, strong)
1
invulnerable(adjective, strong)
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APASmart Define. (2016). unbreakable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unbreakable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>.
MLASmart Define. "unbreakable thesaurus" 5 January 2016. Web. 27 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms>