Definition of thoughtless adjective from the Oxford Advanced American Dictionary

     

    thoughtless

     adjective
    adjective
    NAmE//ˈθɔtləs//
     
    (disapproving)
     
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  1. 1not caring about the possible effects of your words or actions on other people synonym inconsiderate
  2. 2 a thoughtless remark
thoughtlessly
 
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adverb He had behaved thoughtlessly and selfishly.
thoughtlessness
 
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noun [uncountable] I was hurt by her thoughtlessness.
See the Oxford Advanced Learner's Dictionary entry: thoughtless