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Adjective: thoughtless  thot-lus
  1. Showing lack of careful thought
    "the debate turned into thoughtless bickering"
  2. Without care or thought for others
    "the thoughtless saying of a great princess on being informed that the people had no bread; 'Let them eat cake'";
    - uncaring, unthinking

See also: inconsiderate, thoughtfulness, unconsidered, unreflective, unthinking, unthoughtful

Antonym: thoughtful

Encyclopedia: Thoughtless