anencephalic

Medical term that literally means "brainless". Often used to confuse complete idiots who think they're smart.

"Quit acting like such a fool you pompous narcissistic anencephalic moron!"

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Anencephalous

1. (Biology) partially or totally lacking a brain (encephalon).

2. A dumb, dull-witted or obtuse person or being.

Al believes that life on the sun's suface is possible at night time. He's an anencephalous son of a gun.