American English

Definition of careless adjective from the Oxford Advanced American Dictionary

      

    careless

     adjective
    adjective
    NAmE//ˈkɛrləs//
     
     
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  1. 1not 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. 2resulting from a lack of attention and thought a careless mistake/error
  3. 3 not showing interest or effort synonym casual She gave a careless shrug. a careless laugh/smile
 
adverb Someone had carelessly left a window open. She threw her coat carelessly onto the chair. “Whatever,” he said carelessly.
carelessness
 
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noun [uncountable] a moment of carelessness
See the Oxford Advanced Learner's Dictionary entry: careless