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If you call someone daffy, you mean they are silly or a bit crazy, but in a warm, funny way — not dangerous, not cruel. It is informal, a little old-fashioned, and a bit cartoonish. You can say a daffy idea, a daffy grin, or a daffy uncle who wears odd hats. Many meet it first because of Daffy Duck; his name is this word used as a name. It is not a hard insult. British daft is a close neighbour and can sound blunter; daffy is lighter, almost fond. You would not put it in a serious report.
瘋瘋癲癲的、傻氣的（好笑的那種，不是罵人真的瘋了）
組成From older English daff, a fool, plus -y, the ending that makes an adjective (as in messy, funny).
原始詞典資料6 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。
Daffyname
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A diminutive of the female given name Daphne.
- The name Daffy stuck, and to make it worse, Tony added "Duck" as an afterthought. For weeks, he led all the other kids in a chorus of quacks whenever Daphne appeared, but she ignored them.
- 2
A diminutive of the female given name Daffodil.
- "Call me Daffy," Daffodil interrupted with a demure smile.
- 3
A surname from Welsh, derived from the Welsh equivalent of David.
daffyadj詞源 1/ˈdæfi/
- 1
Somewhat mad or eccentric.
- Now I'm hungry as a Rocky Mountain lion so come, let's go and get this poor, daffy, tealess widow and wine and dine with her and make it all up.
- "You've gone so plum daffy you are forgetting your dinner," jeered her mother.
daffynoun詞源 2/ˈdæfi/
- 1
informalA daffodil.
daffynoun詞源 3/ˈdæfi/
- 1
datedslangGin.
- 1837-39, Charles Dickens, Oliver Twist “Do you give the children Daffy, Mrs. Mann?” inquired Bumble, following with his eyes the interesting process of mixing.
- […] he failed repeatedly until he took over his famous house in Haymarket, where for many years, surrounded by such admirers as Byron, Tom Moore and Hazlitt, he smoked his yard of clay, drained his glass of 'daffy', and […]
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。