unthinking

adjective

  1. 1

    mentally sluggish

  2. 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'

  3. 3

    not exhibiting or characterized by careful thought

adverb

  1. 1

    in a thoughtless manner

    he stared thoughtlessly at the picture

Synonyms

Also useful for “unthinking”:Scrabble