Lethargy is the name of the state: that heavy, sleepy lack of energy and interest. If lethargic is how you look or feel, lethargy is the feeling itself.

Lethargy這個字 is the name of the state指的是那種狀態: that heavy, sleepy lack of energy and interest也就是那種沉重、昏昏欲睡、沒精神也沒興趣的感覺。If如果 lethargic是 is how you look or feel是你看起來或感覺到的樣子, lethargy那 is the feeling itself就是那種感覺本身。

You can sink into lethargy after a long illness, in midsummer heat, or when a job has drained you. In everyday talk it means you have no spark.

You你 can sink into lethargy after a long illness可能在生了一場大病之後陷入lethargy, in midsummer heat或在盛夏酷熱時, or when a job has drained you或當一份工作把你榨乾時。In everyday talk在日常說法裡 it它 means you have no spark指的是你提不起勁。

In medical English it is stronger: a serious drowsiness, a warning sign, not just a slow Monday. It is usually uncountable — you have lethargy; you do not often “have a lethargy.” The word is a little formal.

In medical English在醫學英文裡 it它 is stronger語氣更重: a serious drowsiness指的是嚴重的嗜睡, a warning sign是個警訊, not just a slow Monday而不只是星期一提不起勁而已。It它 is usually uncountable通常是不可數名詞 — you你 have lethargy會說have lethargy; you你 do not often 「have a lethargy」不常這樣說。The word這個字 is a little formal有點正式。

It comes from Middle English litargie, from Medieval Latin litargia, from Late Latin lēthārgia, borrowed from Greek lēthārgíā “drowsiness,” from lḗthargos “forgetful, lethargic” plus a noun ending. The river Lethe sits in the background of that root, but lethargy now is about energy, not about wiping memory.

It它 comes from Middle English litargie源自中古英文litargie, from Medieval Latin litargia來自中世紀拉丁文litargia, from Late Latin lēthārgia再往上是晚期拉丁文lēthārgia, borrowed from Greek lēthārgíā 「drowsiness」借自希臘文lēthārgíā（意思是嗜睡）, from lḗthargos 「forgetful, lethargic」 plus a noun ending而這個希臘字又來自lḗthargos（健忘的、昏睡的）加上一個名詞字尾。The river Lethe忘川（Lethe河） sits in the background of that root就藏在這個字源背後, but lethargy now但lethargy現在 is about energy, not about wiping memory講的是精力，不是抹去記憶。