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lackadaisical
01
無気力な, 怠惰な
lazy and dreamy, without much energy or interest
Example
On hot summer days, she felt lackadaisical and preferred lying on the hammock over any activity.
The melody of the slow song put her in a lackadaisical mood, making her drift into her own world.
His lackadaisical attitude towards his studies resulted in poor grades.
02
怠惰な（たいだな）, 気乗りしない（きのりしない）
lacking energy, enthusiasm, or liveliness
Example
Her response was so lackadaisical that I could n't tell if she was interested.
The conference was lackadaisical, with most attendees looking disinterested.
