What is the character development for Hamlet in Act IV?
In Act IV Hamlet is becoming, if anything, more erratic and unpredictable in his behavior. Not only has he yet to inflict revenge on Claudius, he's actually beating himself up over it. We see this in Scene 4 when Hamlet wonders how it is that Norwegian soldiers can risk their necks for a meaningless patch of land while he still can't bring himself to finish off Claudius. Ironically, it's other characters in the play such as Claudius and Laertes who show more resolve in planning to kill Hamlet. The young prince's thoughts may be bloody, but his actions—towards Claudius, at any rate—are anything but.
Hamlet's chronic indecision in...
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In the end of the play we can notice that Hamlet's reactions are becoming more obsessed and bitter towards Claudius and his mother. He even starts to speak in a more bitterness tone. Hamlet grows madder when he decides to describe the sexual encounters of his mother more in details: “Let the bloat king tempt you again to bed, /Pinch wanton on your cheek, call you his mouse, /And let him, for a pair of reechy kisses, /Or padding in your neck with his damn’d fingers,” (4.1.182-185).