2 sentences for 愚 (yú)

1. 愚弟近日安好，请兄放心。

   yú dì jìn​rì ān​hǎo, qǐng xiōng fàng​xīn.

   Your humble younger brother has been well lately; please rest assured, elder brother.

   Source: Dong Chinese Dictionary

2. 这种因小失大的做法实在是太愚了。

   zhè zhǒng yīn​xiǎo​shī​dà de zuò​fǎ shí​zài shì tài yú le.

   This practice of being penny-wise and pound-foolish is truly stupid.

   Source: Dong Chinese Dictionary