idiocy

idiocy
/ˈɪdɪəsɪ; `ɪdɪəsɪ/ n
1 [U]
(a) extreme stupidity 极端愚蠢
    It's sheer idiocy to go climbing in such bad weather. 在这样恶劣的天气里去爬山简直是愚蠢到家了.
(b) state of being an idiot; imbecility 白痴; 极度低能.
2 [C] extremely stupid act, remark, etc 极端愚蠢的行为、 言论等.

牛津英汉双解词典