鴻毛〔鸿-〕 hung⁴ mou⁴ {hóng máo}

a goose feather -- something very light or insignificant

鴻毛泰岱〔鸿---〕 hung⁴ mou⁴ taai³ doi⁶ {hóng máo tài dài}

light as a goose feather, heavy as Mt Tai (idiom); of no consequence to one person, a matter of life or death to another

鴻毛泰山〔鸿---〕 hung⁴ mou⁴ taai³ saan¹ {hóng máo Tài Shān}

1. lit. light as a goose feather, heavy as Mt Tai (idiom)
2. fig. of no consequence to one person, a matter of life or death to another