imbecility的复数形式怎么拼写？

We commented adversely upon the imbecility of that message of telegraphic style.我们对着这条电报式的愚蠢的留言发泄了一通不满....

imbecility的音标：imbecility的英式发音音标为：[ˌɪmbə'sɪlətɪ]imbecility的美式发音音标为：[ˌɪmbə'sɪlətɪ]...

n.愚笨，低能，弱智，愚蠢行为...