This question is based on John Osborne's Look Back in Anger. Jimmy's harmatia is

In John Osborne's play Look Back in Anger, Jimmy Porter's hamartia, or tragic flaw, is his intense anger. This deep-seated rage permeates his interactions and fuels much of the play's dramatic tension. Jimmy's anger stems from his dissatisfaction with his life, his disillusionment with the British class system, and his overwhelming sense of being trapped in a world that he feels offers little opportunity for genuine expression or change.

His anger often manifests through scathing verbal attacks on those around him, including his wife Alison and his friend Cliff. This anger drives the narrative and leads to personal and relational conflicts, ultimately contributing to his isolation and the breakdown of his relationships.

While pride, jealousy, and infidelity also play roles in his character and the play, it is his anger that is the most pronounced and destructive flaw, impacting his life and relationships profoundly.