Sorrow is one of Hamlet's most prominent emotions throughout the play, with his father's death initially serving as the sole cause.
Hamlet's mood is dark and depressed early in the play, but when he is assigned the task of avenging his father's ghost, his desire to discover the truth gives him a sense of urgency and purpose.
His father's untimely death and his mother's hasty remarriage did not help his case. Having said that, his emotions drive him insane.
The knowledge that his uncle betrayed his father and all of Denmark appears to fuel Hamlet, while his mother fails him by marrying her husband's murderer and his friends fail him by feigning loyalty to Hamlet. Above all, Hamlet's melancholy stems from his inability to avenge his father, from his inability to act.
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