Webster's English Dictionary

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enemy

en.e.my \'en-*-me-\ n [ME enemi, fr. OF, fr. L inimicus, fr. in- 1in- + am] 
   often attrib icus friend 1: one that seeks the injury, overthrow, or 
   failure of an opponent  2: something harmful or deadly  3a: a military 
   adversary  3b: a hostile unit or force ENEMY stresses antagonism showing 
   itself in hatred or destructive attitude or action; FOE stresses active 
   fighting or struggle but is used only figuratively of an enemy in war SYN 
   syn ENEMY, FOE mean one who shows hostility or ill will.