nihilism
US /ˈnaɪ.ə.lɪ.zəm/
UK /ˈnaɪ.ə.lɪ.zəm/

1.
nihilisme
the rejection of all religious and moral principles, often in the belief that life is meaningless.
:
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His philosophy was rooted in nihilism, questioning all established values.
Sa philosophie était enracinée dans le nihilisme, remettant en question toutes les valeurs établies.
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The novel explores themes of despair and nihilism.
Le roman explore les thèmes du désespoir et du nihilisme.