Talk:Ken Kaneki/@comment-180.191.98.30-20150116020602/@comment-24494906-20150116165622

The other frequent one is "foolish son" (愚息), I think.

You can also find the other combinations (foolish husband and so on) in dictionaries, but I don't think they're that widely used. "gujou" seems to have been formed by analogy to "foolish son". But it's a good question why Ishida chose 愚娘 (gujou) instead of 愚女 (gujo). 愚女 seems to be more common (you can even find it in dictionaries) and according to a Japanese dictionary this one really seems to have the double meaning "foolish woman" and "my (foolish) daughter".