Dave is high. Dave is big. Harry is small. Harry is thin. Bob is wealthy. Gary is dull. Gary is rough. If someone is not strong then they are dull. If someone is not bad then they are nice. If someone is wealthy then they are smart. If someone is smart and not poor then they are quiet. If someone is dull and not strong then they are sad. If someone is small and thin then they are poor. If someone is poor and not smart then they are rough. All nice people are kind. 
Dave is not sad.