imbecilidad
stupidity
noun eem-beh-see-lee-DAHD Rare
Origin: From Latin imbecillitas (weakness, feebleness).
Also means
imbecility
Usage Note
Imbecilidad is a strong term for extreme stupidity or a profoundly stupid act. Originally a medical term for intellectual disability, it is now used pejoratively and informally. A milder alternative in everyday speech is estupidez or tontería; imbecilidad carries greater contempt.
Examples
"Esa decisión fue una auténtica imbecilidad."
Natural Translation
That decision was genuine stupidity.

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