子こ供どもじみた

noun-modifying (irregular)

childish; immature; infantile

Describes behavior, ideas, or appearance that is immature or childlike in a negative or critical way. Often used for adults acting like children.

• 彼かれの子こ供どもじみた行こう動どうには呆あきれてしまった。

  I was disgusted by his childish behavior.

• そんな子こ供どもじみた言いい訳わけは通つう用ようしないよ。

  Such a childish excuse won't work.