Adverbial thoughtlessly has 2 senses
  1. thoughtlessly, unthinkingly, unthinking - in a thoughtless manner; "he stared thoughtlessly at the picture"
    Antonyms: thoughtfully
    Derived from adjective thoughtless1
  2. thoughtlessly - showing thoughtlessness; "he treated his parents thoughtlessly"
    Antonyms:
    thoughtfully
    Derived from adjective thoughtless3
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