Post-World War II disillusionment refers to the widespread feeling of disappointment and loss of faith in societal institutions and values that emerged in the aftermath of the war. This sense of disillusionment was driven by the horrors of the war, the realization of human brutality, and the failure of traditional beliefs to provide meaning or stability in a rapidly changing world. This feeling permeated literature and art, influencing movements like absurdist drama, which sought to reflect the chaos and meaninglessness of existence.