lack·a·dai·si·cal

[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

lack·a·dai·si·cal·ly, adverb
lack·a·dai·si·cal·ness, noun


2. slothful, unambitious, idle.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
lackadaisical (ˌlækəˈdeɪzɪkəl) [Click for IPA pronunciation guide]
 
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
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00:10
Lackadaisical is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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
Many times, employees may be lackadaisical in their duties knowing their pay
  can't be affected.
But that same lackadaisical guy is the star who talks openly about the burdens
  of being the breadwinner for two labels.
The members are so utterly weary of lackadaisical methods that they are look
  ing for a firm policy.
And with all but two performances ranging from lackadaisical to broad, so does
  the picture.
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