Harry is big. Harry is strong. Dave is little. Dave is small. Gary is wealthy. Fiona is sad. Fiona is rough. If someone is not high then they are sad. If someone is not poor then they are smart. If someone is wealthy then they are nice. If someone is nice and not bad then they are kind. If someone is sad and not high then they are dull. If someone is little and small then they are bad. If someone is bad and not nice then they are rough. All smart people are quiet. 
Harry is not dull.