Hamlet's tragic flaw is his delay in avenging his father's death. Hamlet is still devastated by his father's death when the ghost appears to him, and he is unable to carry through with his revenge until the end of the play. Hamlet's delay in punishing Claudius not only causes his own death, but the deaths of everyone else in his life except for Horatio and Fortinbras. - See more at: http://www.enotes.com/homework-help/what-tragic-flaw-what-tragic-flaw-hamlet-hamlet-5585#sthash.7zkQMZcx.dpuf