嘴上没毛,办事不牢

zuǐ shàng méi máo , bàn shì bù láo

a youth without facial hair cannot be relied upon (proverb)

嘴

zuǐ

mouth

上

shàng

(bound form) up; upper; above; previous

没

méi

(negative prefix for verbs) have not; not

毛

máo

hair

,

,

办

bàn

to take care of (a matter); to deal with (a task, procedure etc); to organize (an event)

事

shì

matter

不

bù

no; not so

牢

láo

firm