Definitions of thoughtful:

• adjective:   having intellectual depth

  Example: "A deeply thoughtful essay"

• adjective:   exhibiting or characterized by careful thought

  Example: "A thoughtful paper"

• adjective:   acting with or showing thought and good sense
• adjective:   showing consideration and anticipation of needs

  Example: "It was thoughtful of you to bring flowers"

• adjective:   taking heed; giving close and thoughtful attention