in·ter·ne·cine /ˌɪntɚ/
  (a.)互相殘殺的,兩敗俱傷的,致命的
  In·ter·ne·cine a.
  1. Involving, or accompanied by, mutual slaughter; mutually destructive.
     Internecine quarrels, horrible tumults, stain the streets with blood.   --Motley.
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  internecine
       adj 1: (of conflict) within a group or organization; "an
              internecine feud among proxy holders"
       2: characterized by bloodshed and carnage for both sides;
          "internecine war" [syn: mutually ruinous]