Definition of idiocy noun from the Oxford Advanced Learner's Dictionary

     

    idiocy

     noun
    noun
    BrE BrE//ˈɪdiəsi//
     
    ; NAmE NAmE//ˈɪdiəsi//
     
    (pl. idiocies)(formal) Stupid
     
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  1. 1[uncountable] very stupid behaviour; the state of being very stupid synonym stupidity It is sheer idiocy to go climbing in this weather. See related entries: Stupid
  2. 2[countable] a very stupid act, remark, etc. the idiocies of bureaucracy
  3. Word Origin early 16th cent. (originally denoting low intelligence): from idiot, probably on the pattern of pairs such as lunatic, lunacy.
See the Oxford Advanced American Dictionary entry: idiocy