1. In a thoughtless manner
   "he stared thoughtlessly at the picture"
   - unthinkingly, unthinking 
2. Showing thoughtlessness
   "he treated his parents thoughtlessly"

See also: thoughtless

Antonym: thoughtfully

• man-eating shark
• man-made
• man-made fiber
• man-made fibre
• man-made lake
• man-o'-war
• man-of-the-earth
• man-of-war
• man-of-war bird
• man-on-a-horse
• man-portable
• man-size
• man-sized
• man-to-man
• mana
• manacle
• manage
• manageability
• manageable
• manageableness
• manageably
• managed economy
• management
• management consultant
• management consulting