imbecility | English to English Dictionary

retardation more severe than a moron but not as severe as an idiot(noun.cognition)

source: wordnet30
a stupid mistake(noun.act)

Synonym:
betise, folly, foolishness, stupidity

source: wordnet30
The quality of being imbecile; weakness; feebleness, esp. of mind.(noun)

source: webster1913

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