also: ぐにん
A somewhat literary or formal term for a foolish person; less common in casual speech than 馬鹿 (ばか) or 阿呆 (あほう).
He is a fool who doesn't realize his own mistakes.
Even a fool sometimes says something wise.
Standard kanji form; the reading ぐじん is the most common.
Alternate reading, less common; may be encountered in older texts.
Compound of 愚 (ぐ, foolish) and 人 (じん, person). The reading ぐにん uses the older go-on reading for 人.