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unbreakable - 2 dictionary results
un·break·a·ble   (ŭn-brā'kə-bəl)   
adj.  
  1. Impossible to break; able to withstand rough usage: unbreakable plates.
  2. Able to withstand an attempt to break. Used of a horse.
n.  An article or object that is not easily broken.
un·break'a·ble·ness n., un·break'a·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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unbreakable 
Use unbreakable in a Sentence
c.1480, from un- (1) "not" + break + -able.
Online Etymology Dictionary, © 2001 Douglas Harper
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