Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun imbecility

2 senses of imbecility

Sense 1
imbecility -- (retardation more severe than a moron but not as severe as an idiot)
       => retardation, mental retardation, backwardness, slowness, subnormality -- (lack of normal development of intellectual capacities)

Sense 2
stupidity, betise, folly, foolishness, imbecility -- (a stupid mistake)
       => mistake, error, fault -- (a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults")