toughened

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• April 10. 2013 from wordnet.princeton.edu

  toughened — adjective — english

  physically toughened; "the tough bottoms of his feet"

• March 31. 2016 from wordnet.princeton.edu

  toughened — adjective — english

  made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass"