Something that's unthinking is done without carefully considering how it might affect other people. An unthinking comment about your best friend's haircut might really hurt her feelings.

If you do something in an unthinking way, it's automatic or impulsive. Your unthinking prejudice against a certain breed of dog, for example, might be undermined when you actually meet a sweet Doberman. And your unthinking run through your Dad's flower garden to catch a football may instantly fill you with regret: if you'd stopped and thought about it, you wouldn't have done it.

Definitions of unthinking
  1. adjective
    not exhibiting or characterized by careful thought
    synonyms: unreflective, unthoughtful
    showing lack of careful thought
  2. adjective
    without care or thought for others
    synonyms: thoughtless, uncaring
    lacking regard for the rights or feelings of others
  3. adjective
    mentally sluggish
    synonyms: lumpen, lumpish
    lacking or marked by lack of intellectual acuity
  4. adverb
    in a thoughtless manner
    synonyms: thoughtlessly, unthinkingly
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    in a thoughtful manner
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