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