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