Definition of careless adjective from the Oxford Advanced Learner's Dictionary

      

    careless

     adjective
    adjective
    BrE BrE//ˈkeələs//
     
    ; NAmE NAmE//ˈkerləs//
     
     
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  1. 1  not giving enough attention and thought to what you are doing, so that you make mistakes It was careless of me to leave the door open. Don’t be so careless about/with spelling. a careless worker/driver opposite careful
  2. 2  resulting from a lack of attention and thought a careless mistake/error
  3. 3careless of something (formal) not at all worried about something He seemed careless of his own safety.
  4. 4not showing interest or effort synonym casual She gave a careless shrug. a careless laugh/smile
  5. Word Familycare noun verbcareful adjective (careless)carefully adverb (carelessly)caring adjective (uncaring) Word Origin Old English carlēas ‘free from care’ (see care, -less).Extra examples He’s very careless with money. She had begun to grow careless. She’s careless about her spelling. Try not to be so careless in the future. When performing his stunts he was careless of his own safety. a rather careless mistake Don’t be so careless about spelling. You’ve made rather a lot of careless mistakes in your work.
See the Oxford Advanced American Dictionary entry: careless