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

• throstle
• throttle
• throttle valve
• throttlehold
• throttler
• throttling
• through
• through an experiment
• through and through
• through empirical observation
• through with
• throughout
• throughput
• throughway
• throw
• throw a fit
• throw a spanner in the works
• throw a wobbly
• throw cold water on
• throw in the towel
• throw off
• throw out
• throw out of kilter
• throw overboard
• throw pillow