- 1
Doing something without energy, care, or real interest — going through the motions. If someone works in a lackadaisical way, they are not lazy exactly; they do the thing, but with no drive behind it, and it shows in the result. A lackadaisical student turns the homework in, but it is half-finished. A lackadaisical waiter brings your food, eventually, and does not seem to care whether you are happy. It can describe a person, or the way something is done: a lackadaisical attitude, a lackadaisical performance, a lackadaisical effort. It is almost always a criticism — nobody praises you for being lackadaisical. It is a long, slightly word; you meet it more in writing, and in sports commentary, than in daily speech. Note that it does not mean relaxed in a good way. 'Laid-back' is a compliment; 'lackadaisical' is not.
散漫的、無精打采的、提不起勁的（帶批評語氣，指做事不上心，不是單純的「懶」）
組成This one is a small surprise. It has nothing to do with 'lack' — that is just how it sounds. It grew out of the old sigh 'lack-a-day!' (an old way of saying 'alas!', roughly 'oh dear'), which became the playful form 'lackadaisy', and then someone added -ic and -al to make an adjective. So the word literally describes a person who goes around sighing softly and doing nothing much.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
lackadaisicaladj/ˌlækəˈdeɪzɪkəl/
- 1
Showing no interest, vigor, determination, or enthusiasm.
- the lackadaisical look on his face
- I, at one time, used to go and take a hand at cribbage with a friend, and afterwards discuss a cold sirloin of beef, and throw out a few lackadaisical remarks, in a way to please myself, but it would not do long.
- 2
Lazy; slothful; indolent.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。