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The character 愚 (yú) meaning 'foolish, stupid' has an interesting evolution. It is composed of two parts: 禺 (a kind of monkey or mythological creature) at the top, and 心 (heart/mind) at the bottom. The original concept was that of a 'monkey mind' - restless, imitative, and lacking deeper understanding. In ancient Chinese philosophy, this represented someone who acts without wisdom or reflection, following superficial impulses rather than true knowledge. Over time, the character solidified its meaning of foolishness, stupidity, or simple-mindedness, reflecting the Confucian value placed on wisdom and learning. Arrived in Japan: The character 愚 likely arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing system (kanji) through Buddhist texts and Chinese classics. It was formally incorporated into the Japanese writing system and appears in early Japanese literary works from the Nara period (710-794 CE).