That's incorrect usage.
You'd say "I haven't seen him"
Answer:
I found this on the internet. I hope it helps:
The massive dust storms caused farmers to lose their livelihoods and their homes. Deflation from the Depression aggravated the plight of Dust Bowl farmers. Prices for the crops they could grow fell below subsistence levels. In 1932, the federal government sent aid to the drought-affected states
Someone who is eccentric means they have unusual or odd behavior, this then relates to the origin of the word which is egocentric meaning self centered. This then also goes on to relate to "center" because a person is "self centered" or egocentric.
High egocentrism = eccentric = self CENTERED
