'Hard neck' is a vivid, metaphorical idiom describing a person who is stubborn, inflexible, or unwilling to yield—even when presented with good reasons or advice. The character 硬 (yìng) means 'hard' or 'stiff', 脖 (bó) means 'neck', and 子 (zi) is a common noun suffix. Literally, it evokes the image of someone physically stiffening their neck in defiance, refusing to bow or turn—a gesture of resistance deeply embedded in Chinese body language and cultural expression.

This term is informal and slightly colloquial, often used in everyday speech or light storytelling. It carries mild disapproval or gentle teasing rather than harsh criticism; parents might call a headstrong child a 硬脖子, and friends may joke about each other’s 硬脖子 tendencies during disagreements. While not vulgar, it’s rarely used in formal writing or respectful address—avoid applying it to superiors or elders without appropriate context or tone.