大草包

dàcǎobāo ㄉㄚˋ ㄘㄠˇ ㄅㄠ

    • person with an impressive reputation or look but no real ability
    • empty suit

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
big straw sack
Meaning
A person with an impressive reputation or look but no real ability. Contemptuous; like 'an empty suit' or 'a windbag'.

Sources