Nimrod was a mighty hunter, strong, swift, and wily, in Greek (I think it was Greek) mythology.
What I can't figure out is, How and when did the name come to be used to designate unthinking silly people?
I'm wondering whether it's being confused with Mork's "nimno". Or some mush bnetween that and 'nitwit' (a nit being the egg of a louse, i.e., a tiny thing that hatched into a brainless but annoying parasite).
Just wondering.