Opposed to or acting against civilians or civilian populations; not respecting or protecting non-military people.
From anti- (against) + civilian (from Latin 'civilis' meaning of citizens). This military/political term describes attitudes or actions that target or endanger ordinary non-combatant people.
International laws like the Geneva Conventions were created precisely because 'anticivilian' warfare was so common—defining what counts as a protected civilian is surprisingly recent in military history.
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