This is a very opinionated question. There are multiple ways to view Macbeth's character, and while others may view this question differently, I do not believe that Macbeth is brave. At the beginning of the play, we understand from Duncan that Macbeth is loyal and courageous in battle. However, Lady Macbeth seems to think that while Macbeth is ambitious, he lacks the mettle to act. Making a move on Duncan only happens at Lady Macbeth's ordering, and waging war on Malcolm only happens because of the false sense of invincibility that comes from the Weird Sister's ambiguous prophecies. When Macbeth discovers that he interpret them incorrectly, his first instinct is to flee. These are not the actions or responses of a brave man.