Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Impossible to break; able to withstand rough usage: unbreakable plates.
  • adj. Able to withstand an attempt to break. Used of a horse.
  • n. An article or object that is not easily broken.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. difficult to break and therefore able to withstand rough usage
  • adj. not able to be broken in

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. impossible to break especially under ordinary usage

Etymologies

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