unbreakable

1. Impossible to break especially under ordinary usage (synset 300713189)
   "unbreakable plastic dinnerwear"
   tells us about: breakableness - the consistency of something that breaks under pressure
   similar to:

   • infrangible - difficult or impossible to break or separate into parts
   • shatterproof, splinterless, splinterproof - resistant to shattering or splintering

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