lackadaisical

[lak-uh-dey-zi-kuhl]
adjective
1.
without interest, vigor, or determination; listless; lethargic: a lackadaisical attempt.
2.
lazy; indolent: a lackadaisical fellow.

Origin:
1760–70; lackadais(y) (variant of lackaday) + -ical

lackadaisically, adverb
lackadaisicalness, noun


2. slothful, unambitious, idle.
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World English Dictionary
lackadaisical (ˌlækəˈdeɪzɪkəl)
 
adj
1.  lacking vitality and purpose
2.  lazy or idle, esp in a dreamy way
 
[C18: from earlier lackadaisy, extended form of lackaday]
 
lacka'daisically
 
adv
 
lacka'daisicalness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

lackadaisical
1768, from interjection lackadaisy "alas, alack" (1748), an alteration of lack-a-day (1690s), from alack the day. Hence, "given to crying 'lack-a-day,' vapidly sentimental." Sense probably altered by influence of lax. Related: Lackadaisically.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But that same lackadaisical guy is the star who talks openly about the burdens
  of being the breadwinner for two labels.
Lackadaisical customer service, with erratic parts supplies, are only bad
  memories.
And with all but two performances ranging from lackadaisical to broad, so does
  the picture.
Many times, employees may be lackadaisical in their duties knowing their pay
  can't be affected.
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