習ならい性しょう

noun

ingrained habit; second nature

Refers to a habit so deeply learned that it feels like an innate part of one's character. Often used in the proverb 習い性となる (habit becomes second nature).

• 毎まい朝あさのジョギングはもう習ならい性しょうになった。

  My morning jog has already become second nature.

• 習ならい性しょうとなるから、良よい習しゅう慣かんを身みにつけよう。

  Since habit becomes second nature, let's develop good habits.