Dictionary![]() ![]() lack•a•dai•si•calPronunciation: (lak"u-dā'zi-kul), [key] —adj. 1. without interest, vigor, or determination; listless; lethargic: a lackadaisical attempt. 2. lazy; indolent: a lackadaisical fellow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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