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