Without vigor, determination, or interest; lethargic; listless; indolent.
Note: This word is not pronounced with an x, as in laxadaisical. Start the word with lack.
Those who stop obey orders. Able-bodied, clean-minded women we want also—mothers and teachers. No lackadaisical ladies—no blasted rolling eyes. We can’t have any weak or silly. Life is real again, and the useless and cumbersome and mischievous have to die. They ought to die. They ought to be willing to die.
—H. G. Wells The War of the Worlds (1898)