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Noun: thoughtlessness  thot-lus-nus
  1. The quality of failing to be considerate of others
    "His thoughtlessness in playing loud music late at night angered the neighbours";
    - inconsideration, inconsiderateness
     
  2. The trait of not thinking carefully before acting
    "His thoughtlessness often resulted in careless mistakes";
    - unthoughtfulness

Type of: trait, unkindness

Antonym: thoughtfulness