Hamlet's disposition reflects both his mother and father's personality. That is, resolution and infirmity. Thus his intentions are countered by weak performance. Hamlet is conscious of his own defect. His life is one of constant analysis of alternatives.
Imagination is so active that thinking about something becomes better than doing it.
To one in the world of ideas, the world of acts is not significant. Hamlet's will is paralyzed by his intellect. Hamlet is part of higher reality of philosophy and poetry. Thus he lacks practical efficiency. Hamlet feels anguish caused by his father being replaced in his mother's affections.