Harry is huge. Harry is strong. Gary is thin. Gary is short. Anne is quiet. Fiona is rough. Fiona is dull. If someone is not high then they are rough. If someone is not bad then they are kind. If someone is quiet then they are wealthy. If someone is wealthy and not poor then they are nice. If someone is rough and not high then they are sad. If someone is thin and short then they are poor. If someone is poor and not wealthy then they are dull. All kind people are smart. 
Gary is not dull.