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