How are thwe witches in Macbeth described?

in the beginning of the play, he is pretty much controlled by his wife. later on though, they both have complete character changes as Macbeth begins to "wear the pants in the relationship". he becomes power hungry and careless. in the most famous speech in the play, Macbeth describes life as meaningless and pointless. in the end, he dies alone and hated by his once close friends.