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Adjective: internecine  ,in-tu(r)'ne,seen or ,in-tu(r)'nee,sIn [N. Amer], ,in-tu(r)'nee,sIn [Brit]
  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"

See also: bloody, internal