internecine

internecine
[ˌɪntəˈniːsʌɪn]
adjective
  1. destructive to both sides in a conflict
    (冲突双方)两败俱伤的
    the region's history of savage internecine warfare.
    该地区野蛮相互残杀的战争史。
    ■of or relating to conflict within a group or organization
    内部斗争的
语源
  1. mid 17th cent. (in the sense 'deadly, characterized by great slaughter'): from Latin internecinus, based on inter- among + necare 'to kill'
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