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

• skylark
• skylight
• skyline
• skype
• skyrocket
• skysail
• skyscraper
• skywalk
• skyward
• skywards
• skyway
• skywriter
• skywriting
• SL
• slab
• slabber
• slabbing
• slack
• slack off
• slack suit
• slack tide
• slack up
• slack water
• slacken
• slacken off