unthinking

Adjective

• mentally sluggish

• without care or thought for others; `Let them eat cake'"
  • the thoughtless saying of a great princess on being informed that the people had no bread
    

• not exhibiting or characterized by careful thought

Adverb

• in a thoughtless manner
  • he stared thoughtlessly at the picture
    

Related words

• Synonyms: 
  lumpish , lumpen , thoughtless , uncaring , unreflective , unthoughtful , thoughtlessly , unthinkingly