[lak-uh-dey-zi-kuh l] /ˌlæk əˈdeɪ zɪ kəl/

without interest, vigor, or determination; listless; lethargic:
a lackadaisical attempt.
lazy; indolent:
a lackadaisical fellow.
lacking vitality and purpose
lazy or idle, esp in a dreamy way

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.


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