Why is Macbeth so.....?

Doublespeak is any language which is used to hide it's true meaning. Like smiling at someone while planning on stabbing them in the back. Politicians and Car Salesmen are great examples of this. Duality means the two sides of a person's character. For instance the character of Hamlet is filled with duality. Is he planning to kill for honor or for hate? Is he a good guy or a bad guy? Is he a little of both? Hope this helps a bit.