1. Having intellectual depth
   "a deeply thoughtful essay" 
2. Exhibiting or characterized by careful thought
   "a thoughtful paper" 
3. Acting with or showing thought and good sense
   - serious-minded 
4. Taking heed; giving close and thoughtful attention
   - heedful, attentive, paying attention 
5. Considerate of the feelings or well-being of others

See also: attentiveness, bemused, brooding, broody, cogitative, considerate, contemplative, deep in thought, deliberative, excogitative, heed, lost, meditative, musing, paying attention, pensive, pondering, preoccupied, profound, reflective, regard, ruminative, serious, thoughtfully, thoughtfulness, well thought out

Antonym: thoughtless

Encyclopedia: Thoughtful

• school paper
• school phobia
• school principal
• school ship
• school superintendent
• school system
• school term
• school text
• school year
• school-age child
• schoolbag
• schoolbook
• schoolboy
• schoolboyish
• schoolchild
• Schoolcraft
• schooldays
• schoolfellow
• schoolfriend
• schoolgirl
• schoolgirlish
• schoolhouse
• schoolie
• schooling
• schoolma'am