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