Why couldn't Lady Macbeth kill duncan?

The short answer to the question of why Lady Macbeth didn't kill King Duncan is that she thought about doing it but couldn't bring herself to go through with such a bloody deed because he looked too much like her father. read more

Sleeping there, he looked like her father, who she presumably loved. Or she used that as an excuse because she was too scared to kill him herself. (Thus being guilty of that which she accused Macbeth of being). read more

There are a few reasons why Lady Macbeth does not kill King Duncan herself. First, in Act 2, Lady Macbeth says that the king resembles her own father, so therefore she cannot kill him. More importantly, however, Lady Macbeth as a woman must follow the social conventions of her time. read more