Main entry: lumpen, lumpish, unthinking
Definition: mentally sluggish
Main entry: thoughtless, uncaring, unthinking
Definition: without care or thought for others
Usage: the thoughtless saying of a great princess on being informed that the people had no bread; `Let them eat cake'
Main entry: unreflective, unthinking, unthoughtful
Definition: not exhibiting or characterized by careful thought
Main entry: thoughtlessly, unthinking, unthinkingly
Definition: in a thoughtless manner
Usage: he stared thoughtlessly at the picture