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.
Webster's English Dictionary