A person or thing which exhibits traits of high stupidity

From Middle English (denoting a person of low intelligence): via Old French from Latin sperria ‘ignorant person’, from Greek sperōēs ‘person of low intellect, layman, ignorant person’, from sperios ‘simple, quirky’.
Zach: I backed my truck into a trailer again.

Abe: Of course you did, you're such a sperald!
by Mr Shin August 25, 2019
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