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