嘴上沒毛，辦事不牢 [－－没－－办－－－]

Jyutping zeoi2 soeng6 mut6 mou4 ， baan6 si6 bat1 lou4
Pinyin zuǐ shàng méi máo ， bàn shì bù láo

Definitions (Wiktionary)
  1. proverb
    a young person is unreliable to do things.

嘴上沒毛，辦事不牢 [－－没－－办－－－]

Jyutping zeoi2 soeng6 mut6 mou4 , baan6 si6 bat1 lou4
Pinyin zuǐ shàng méi máo , bàn shì bù láo

Definitions (CC-CEDICT)
  1. a youth without facial hair cannot be relied upon (proverb)