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unbreakable

Flag: gbEnglishOxford American Thesaurus
unbreakable
adjective
a new type of unbreakable plastic bottle:
shatterproof, nonbreakable, indestructible, imperishable, resistant, durable, everlasting, long-lasting, made to last;
toughened, sturdy, stout, hardwearing, heavy-duty;
literary adamantine;
rare infrangible.
▷antonyms fragile, flimsy.