In Brief
Lady Macbeth is one of Shakespeare’s most famous and frightening female characters. Lady Macbeth fulfills her role among the nobility and is well respected like Macbeth. King Duncan calls her "our honored hostess." She loves her husband but at the same time very ambitious, as shown by her immediate determination for Macbeth to be king. This outcome will benefit her and her husband equally. She immediately concludes that "the fastest way" for Macbeth to become king is by murdering King Duncan.
In many respects, Lady Macbeth is a classic femme fatal. She manipulates her husband with remarkable effectiveness, overriding all his objections; when he hesitates to murder; she repeatedly questions his manhood until he feels that he must commit murder to prove himself. Lady Macbeth’s strength of will persists through the murder of the king—it is she who steadies her husband’s nerves immediately after the crime has been perpetrated.
Lady Macbeth’s Role in the Play So Far
Lady Macbeth hears both of the coming royal visit, and also of the appearance and words of the three witches. Although a bold, ambitious, worldly woman, she from the first believes them, implicit faith in witchcraft and magic being evidently general, if not universal, in Scotland at this period. She has all her husband's ambition, without a particle of his loyalty to the King, which prevents his following her counsels as speedily and eagerly as she wishes. Directly she hears of the King's visit, she resolves in her own mind that he shall never leave Macbeth's castle alive. For she thoroughly believes the witches' prediction about her husband's becoming king, and, though they never suggested crime as necessary to confirm their prophecy, she resolves to persuade Macbeth to remove every obstacle to its fulfillment.
She reads in her husband's castle a letter from him announcing his strange meeting with the witches, their telling him he will become King