Webster's English Dictionary

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adamant

Cross references:
  1. inflexible            
 
1. ad.a.mant \'ad-*-m*nt, -.mant\ n [ME, fr. OF, fr. L adamant-, adamas 
   hardest metal, diamond fr. Gk] 1: a stone believed to be of impenetrable 
   hardness  2: an unbreakable or extremely hard substance 
2. adamant aj : unshakable or immovable esp. in opposition : UNYIELDING  - 
   ad.a.mant.ly av