大人おとな気げ

noun

adultness; maturity

Refers to the quality of being grown-up, responsible, or emotionally mature. Often used in negative expressions like 大人気ない (childish, immature).

• 彼かれの行こう動どうは大人おとな気げない。

  His behavior is childish.

• 大人おとな気げのある対たい応おうを心こころがけたい。

  I want to try to act in a mature manner.