indestructible, durable, everlasting, perdurable, brass-bound, cast-iron, lasting, unshakable, solid, firm, unchangeable, invulnerable, incorruptible, resistant, rugged, tight, unyielding, adamantine.
Antonyms dainty*, fragile, brittle.
"unbreakable." YourDictionary, n.d. Web. 21 March 2019. <https://thesaurus.yourdictionary.com/unbreakable>.
unbreakable. (n.d.). Retrieved March 21st, 2019, from https://thesaurus.yourdictionary.com/unbreakable
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