不ふ熱ねっ心しん

na-adjective, noun

indifference; lack of enthusiasm; inattentiveness

Describes a person, attitude, or effort that is not enthusiastic or committed. Often used in contexts like study, work, or participation.

• 彼かれは勉べん強きょうに不ふ熱ねっ心しんだ。

  He is indifferent to his studies.

• 不ふ熱ねっ心しんな態たい度どでは上じょう達たつしない。

  You won't improve with a half-hearted attitude.