耳朵硬

ěrduoyìng ㄦˇ ˙ㄉㄨㄛ ㄧㄥˋ

    • firm in one's views
    • stubborn
    • unwilling to change one's mind

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
hard ears
Meaning
Describes someone with firm views, who won't change their mind whatever others say. It can be approving or can mean stubborn.

Sources