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lackadaisical

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

1760–70; lackadais(y) (variant of lackaday) + -ical
Related formslack·a·dai·si·cal·ly, adverblack·a·dai·si·cal·ness, noun

Synonyms

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2. slothful, unambitious, idle.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for lackadaisicalness

lackadaisical

adjective
  1. lacking vitality and purpose
  2. lazy or idle, esp in a dreamy way
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Derived Formslackadaisically, adverblackadaisicalness, noun

Word Origin

C18: from earlier lackadaisy, extended form of lackaday
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for lackadaisicalness

lackadaisical

adj.

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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Online Etymology Dictionary, © 2010 Douglas Harper