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何食わぬ顔 (nanikuwanukao) Japanese meaning | Kotomora
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He told a lie with an innocent look on his face.
After the mischief, the cat had a nonchalant look.
Related words 知し らん 顔かお 知らん顔 means pretending not to know or ignoring something, while 何食わぬ顔 specifically refers to a facial expression that hides one's knowledge or involvement.
澄す ました 顔かお 澄ました顔 implies a composed or smug look, often with an air of superiority, whereas 何食わぬ顔 is about feigning innocence or ignorance.
Etymology The phrase literally means 'a face that hasn't eaten anything,' figuratively suggesting a look of innocence as if one has done nothing wrong. The exact origin is uncertain, but it is a well-established idiomatic expression.
