showing consideration for others; considerate.
characterized by or manifesting careful thought: a thoughtful essay.
occupied with or given to thought; contemplative; meditative; reflective: in a thoughtful mood.
careful, heedful, or mindful: to be thoughtful of one's safety.

1150–1200; Middle English; see thought1, -ful

thoughtfully, adverb
thoughtfulness, noun
overthoughtful, adjective
overthoughtfully, adverb
overthoughtfulness, noun
unthoughtful, adjective
unthoughtfully, adverb
unthoughtfulness, noun

1. attentive, solicitous. Thoughtful, considerate mean taking thought for the comfort and the good of others. Thoughtful implies providing little attentions, offering services, or in some way looking out for the comfort or welfare of others: It was thoughtful of you to send the flowers. Considerate implies sparing others annoyance or discomfort, and being careful not to hurt their feelings: not considerate of his family. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thoughtful (ˈθɔːtfʊl)
1.  considerate in the treatment of other people
2.  showing careful thought
3.  pensive; reflective

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1200, "contemplative," from thought + -ful. Also in M.E., "prudent; moody, anxious." Meaning "showing consideration for others" is from 1851. (Cf. thoughtless.)
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Her thoughtful expression and strong hands immediately strike the viewer.
But if the photographer is thoughtful about how to use the light, magical
  images can be made.
The editors-and the critics themselves-make a strong case for professional and
  thoughtful criticism.
It, too, is a work of an amazingly precise and thoughtful serenity while
  evoking the quiet outrage of reason abused.
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