沈思ちんし黙考もっこう
chinshimokkō

Expression

1. being lost in deep thought

Yojijukugo
かれ善悪ぜんあく問題もんだいについて沈思ちんし黙考もっこうした。
karewa zen'akuno mondaini tsuite chinshimokkō shita.
He meditated on the problem of good and evil.