腹中空

fùzhōngkōng ㄈㄨˋ ㄓㄨㄥ ㄎㄨㄥ

    • ignorant
    • having no learning

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
empty in the belly
Meaning
Having no learning or knowledge. Mildly mocking.

Sources