The antonyms have distinct nuances: *Drowsiness* conveys a temporary feeling of sleepiness, while *lethargy* denotes a more prolonged state of physical or mental weariness. Use these words in healthcare, education, and workplace contexts to describe symptoms of fatigue, sleepiness, or lack of energy.

과식을 한 후 그는 *졸음*을 느끼고 낮잠을 자야 했습니다.

重い食事の後、彼は*眠気*を感じ、昼寝をしなければなりませんでした。

After a heavy meal, he felt a sense of *drowsiness* and had to take a nap.

더운 날씨로 인해 노동자들은 *무기력*을 경험했고 업무에 집중하기 어려웠습니다.

暑さのため、労働者は*無気力*の感覚を経験し、仕事に集中するのが難しいと感じました。

Due to the hot weather, the workers experienced a sense of *lethargy* and found it hard to concentrate on their tasks.