If the word 'fraud' means "deceiving", then why doesn't 'defraud' mean the opposite

Answer 1

Debait Defense Debunk Deny Delirious Demand. I must admit I have asked questions along this same vein. In order to be nonchalant, must you be chalant

Answer 2

That's clever, I've never thought about it like that before. I really don't know why. The English language can be kinda kooky sometimes, ask anyone trying to learn it as their second language. :o)