A man who believes that the past few centuries of scientific data developed by thousands of great minds is all wrong and that the earth was conjured in 6 days 6,000 years ago by an invisible man. Totally ignorant to carbon dating(or anything any relevant to science for that matter), these people remain as primitive as we once were in the middle ages.
The short definition:
One whose IQ is vastly exceeded by his shoe size.
Kevin: Crazy Young earth creationists hold back true science.