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Adjective: unthinking  ,ún'thing-king
  1. Not exhibiting or characterized by careful thought
    "unthinking innocence involves knowledge of good and evil, but the knowledge is not deep enough";
    - unreflective, unthoughtful
  2. Without care or thought for others
    "the unthinking saying of a great princess on being informed that the people had no bread; 'Let them eat cake'";
    - thoughtless, uncaring
  3. Mentally sluggish
    - lumpish, lumpen
Adverb: unthinking  ,ún'thing-king
  1. In a thoughtless manner
    - thoughtlessly, unthinkingly

See also: inconsiderate, stupid, thoughtless