stupidity

stupidity
/stju:ˈpɪdətɪ; ?@ stu:-; stu`pɪdətɪ/ n
1 [U] state of being stupid 笨; 愚蠢.
2 [C usu pl 通常作复数]
stupid act, remark, etc 愚蠢的行为、 言语等
    the stupidities of schoolboy humour 男学童调皮的愚蠢言行.

牛津英汉双解词典