rǔ​xiù​wèi​gān

immature

乳臭未干 (乳臭未乾) rǔ​xiù​wèi​gān
immature expression
immature and inexperienced; still wet behind the ears

He's just a wet-behind-the-ears kid; what does he know about these things?

Frequency

Movie subtitles
1.25 per million appears in 1% of films
Written text
0.162 per million

Sources

Definitions
CC-CEDICT