internecine

Internecine is an adjective describing conflict within a single group that is mutually destructive to the participants, often weakening the entire group rather than delivering victory over an external foe. It is typically used to characterize internal power struggles, factional feuds, or civil strife where both sides incur losses.

Etymology and scope: the word derives from Latin internecīnus, from inter "between" and necare "to kill." In English, it conveys the sense of harm done within a community, organization, or state rather than fighting an outside enemy. It is commonly applied to political parties, religious groups, or military factions engaged in internal conflict.

Usage notes and examples: "internecine warfare" or "internecine feuds" are standard collocations. The term carries a strong negative connotation, emphasizing self-destructive consequences. For example, "The internecine rivalries among the party factions weakened the government." It should not be used to describe conflicts between sovereign states or peoples opposing an external power; that would be described as wars or conflicts with external enemies. Related terms include infighting and intra-organizational conflict.