乳にゅう臭しゅう

noun

boyishness; inexperience; greenness

Figurative expression likening youthful inexperience to the lingering smell of milk. Often used in set phrases like 乳臭い (にゅうしゅうくさい) or 乳臭児 (にゅうしゅうじ).

• 彼かれの意い見けんにはまだ乳にゅう臭しゅうが残のこっている。

  His opinions still have a trace of inexperience.

• 乳にゅう臭しゅう児じには任まかせられない仕し事ごとだ。

  It's a job that can't be left to a greenhorn.