痴呆

• ピンイン: chī dāi
• 漢字の分解: 痴 = 疒 (illness) + 知 (know) = foolish/obsessed; 呆 = 口 (mouth) + 木 (wood) = dull/stunned

意味

認知症（痴呆）／ぼんやりして呆けた様子

Medical term for dementia (老年痴呆). Also used colloquially to describe someone looking dazed, stunned, or mentally slow. Context determines whether it's clinical or casual.

例文

1. 老年痴呆症是一种常见的神经退行性疾病。
2. 他听到这个消息后愣在那里，一脸痴呆的样子。
3. 现在很多人更愿意用认知症来代替老年痴呆这个词。

使い方ガイド

場面: medical, description, colloquial

トーン: clinical

正しい言い方

• 预防老年痴呆要多动脑。(To prevent dementia, keep your brain active.)
• 他被吓得痴呆了似的站在那儿。(He stood there looking stunned as if in a daze.)

避ける言い方

• 你真痴呆 (Can be very offensive as an insult — be careful with casual usage)

起源と歴史

Compound of 痴 (foolish/infatuated) and 呆 (dull/stunned). Together they describe a state of mental dullness or confusion.

文化的背景

世代: All ages

社会的背景: Universal