嘴上无毛，办事不牢 (嘴上無毛，辦事不牢) zuǐ shàng wú máo bàn shì bù láo

zuǐ shàng wú máo bàn shì bù láo set phrase a youth without facial hair cannot be relied upon
Domain: Proverb 谚语
Notes: (CC-CEDICT '嘴上無毛，辦事不牢'; Guoyu '嘴上無毛，辦事不牢')