#1 thoughtful a. exhibiting or characterized by careful thought; "a thoughtful paper". wn
#2 thoughtful s. [serious-minded] acting with or showing thought and good sense; "a sensible young man". wn
#3 thoughtful a. [heedful, attentive, paying attention] taking heed; giving close and thoughtful attention; "heedful of the warnings"; "so heedful a writer"; "heedful of what they were doing". wn
#4 thoughtful s. considerate of the feelings or well-being of others. wn
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