Dave is strong. Dave is high. Charlie is short. Charlie is small. Bob is wealthy. Fiona is poor. Fiona is dull. If someone is not huge then they are poor. If someone is not bad then they are smart. If someone is wealthy then they are nice. If someone is nice and not rough then they are kind. If someone is poor and not huge then they are sad. If someone is short and small then they are rough. If someone is rough and not nice then they are dull. All smart people are quiet. 
Dave is not sad.