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internecine
01
истребительный
of a destructive or deadly nature
02
междоусобный
(of a conflict, struggle, or fight) taking place among the people that are from the same country, belief system, group, organization, etc.
Пример
Their internecine conflict caused a lot of trouble within the organization.
The internecine battles among the leaders led to chaos in the government.
The country was torn apart by internecine warfare between different factions.
The internecine struggle within the party weakened its ability to lead effectively.
Even though they shared the same goals, their internecine disputes made cooperation difficult.
