Act I Scene V

If Macbeth is indecisive, Lady Macbeth is just the opposite—a character with such a single vision and drive for advancement that she brings about her own demise. And yet her very ruthlessness brings about another form of ambiguity, for in swearing to help Macbeth realize the Weird Sisters' prophecy, she must cast off her femininity. In a speech at the beginning of Scene 5, she calls on the spirits of the air to take away her womanhood:

Come you spirits That tend on mortal thoughts, unsex me here, And fill me from the crown to the toe top-full Of direst cruelty. Make thick my blood, Stop up th'access and passage to remorse, That no compunctious visitings of nature Shake my fell purpose, nor keep peace between Th'effect and it. (I v 38-45)

Lady Macbeth sees "remorse" as one of the names for feminine compassion—of which she must rid herself. Thus she must be "unsexed." This does not mean, however, that in rejecting her femininity she becomes manly. Instead, she becomes a woman devoid of the sexual characteristics and sentimentality that make her a woman. She becomes entirely unnatural and inhuman. Like the supernatural Weird Sisters with their beards, Lady Macbeth becomes something that does not fit into the natural world.