careless

Adjective

careless (comparative more careless, superlative most careless)

1. Not concerned or worried (about).
   • "He was here," observed Drina composedly, "and father was angry with him."
     "What?" exclaimed Eileen. "When?"
     "This morning, before father went downtown."
     Both Selwyn and Lansing cut in coolly, dismissing the matter with a careless word or two; and coffee was served—cambric tea in Drina's case.1907 August, Robert W[illiam] Chambers, chapter IV, in The Younger Set, New York, N.Y.: D. Appleton & Company, →OCLC
2. Not giving sufficient attention or thought, especially concerning the avoidance of harm or mistakes.
   • Jessica was so careless that she put her shorts on backwards.
   • These ballads, none of which are later than the fifteenth century, are written in a strain of the most artless simplicity, not the slightest attempt at ornament is to be discerned in them; the same ideas and expressions continually recur, and the rimes are the most careless imaginable, often a mere...1828, Thomas Keightley, The Fairy Mythology, volume I, London: William Harrison Ainsworth, page 132

   Synonyms:

   negligent, reckless

3. (archaic) Free from care; unworried, without anxiety.
   • Jessica was careless about putting her shorts on properly.
   • Good-humored, easy, and careless, he presided over his whale-boat as if the most deadly encounter were but a dinner, and his crew all invited guests.1851 November 14, Herman Melville, chapter 27, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, →OCLC

   Synonyms:

   laid-back, unconcerned, airy, at ease, at peace, carefree, casual, chill, cool, devil-may-care