noun
my older brother
Humble term used to refer to one's own older brother when speaking to someone outside the family. The kanji 愚 (foolish) is a self-deprecating prefix common in humble language.
愚兄が先日、海外から帰国いたしました。
My older brother returned from abroad the other day.
愚兄は現在、大阪に住んでおります。
My older brother currently lives in Osaka.
noun
foolish older brother
Literal meaning based on the kanji, but rarely used as a standalone insult. More often encountered as a self-deprecating humble reference (sense 1) or in literary contexts.
彼は愚兄のせいで家業が傾いたと嘆いた。
He lamented that the family business had declined because of his foolish older brother.