- lackadaisical (adj.)
[lackadaisical 词源字典]
- 1768 (Sterne), from interjection lackadaisy "alas, alack" (1748), an alteration of lack-a-day (1690s), from alack the day (1590s). Hence, "given to crying 'lack-a-day,' vapidly sentimental." Sense probably altered by influence of lax. Related: Lackadaisically.[lackadaisical etymology, lackadaisical origin, 英语词源]