不熱心|ふねっしんfunesshin[2]nakadaka (mid-high)

1. na-adjective, nounindifference; lack of enthusiasm; inattentiveness

• Synonym無関心むかんしんNeutralIndifference stressing a lack of interest; 「不熱心」 stresses not putting energy into something.
• Synonym無関心さNeutralA nominalized way to say the degree of indifference; rarely used.
• Related無気力むきりょくNeutralListlessness, having no energy — a broader term; 「不熱心」 applies to a particular thing.
• Related無頓着むとんちゃくNeutralNot caring about or being particular about something, as in 「服装に無頓着」; 「不熱心」 stresses lacking drive.
• Related無感動むかんどうWrittenWritten/formal prose for being unmoved, stressing dullness of feeling.
• Related無気力さNeutralA nominalized way to say the state of lacking drive; rarely used.
• Related無頓着さNeutralA nominalized way to say an attitude of not caring; rarely used.
• Antonym熱心ねっしんNeutralEnthusiastic and eager, as in 「熱心な学生」; the direct opposite of 「不熱心」.

Use 「不熱心」 for not being active or diligent about something, as in 「勉強に不熱心」. For indifference use 「無関心」, for not caring at all 「無頓着」; 「無気力」 covers listlessness. 「熱心」 is the opposite, meaning enthusiastic.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. あることに対たいして、興味きょうみや関心かんしんがなく、進すすんでやろうとしない様子ようす。