无动于衷 wúdòngyúzhōng aloof
aloof; indifferent; unconcerned
How to remember 无动于衷: 无 have not + 动 move + 于 at + 衷 sincere = aloof.
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How it is used
- Idiom: utterly unmoved / indifferent - 'nothing stirs the heart': 对他的请求无动于衷 (duì tā de qǐngqiú wúdòng yú zhōng) unmoved by his plea.
- Critical tone: someone stays cold when they should feel or react. Note 衷 = inner feelings.