Antonym: thoughtless. Similar words: a thought, forethought, at the thought of, deep in thought, frightful, delightful, though, although. Meaning: ['θɔːtfʊl] 
adj. 1. having intellectual depth 2. exhibiting or characterized by careful thought 3. acting with or showing thought and good sense 4. taking heed; giving close and thoughtful attention 5. considerate of the feelings or well-being of others.
adj. 1. having intellectual depth 2. exhibiting or characterized by careful thought 3. acting with or showing thought and good sense 4. taking heed; giving close and thoughtful attention 5. considerate of the feelings or well-being of others. 
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(1) She's a very kind and thoughtful person.
(2) He has a thoughtful approach to his work.
(3) He remained thoughtful for a while.
(4) He had a thoughtful look on his face.
(5) Nancy, who had been thoughtful for some time, suddenly spoke.
(6) Paul is very thoughtful.
(7) He is a quietly spoken(Sentence dictionary), thoughtful man.
(8) Douglas was a complex man, thoughtful, gallant, and generous.
(9) This is a thoughtful essay.
(10) He relapsed into a thoughtful mood at once.
(11) She is thoughtful for her friends.
(12) This intriguing book is both thoughtful and informative.
(13) It was very thoughtful of you to send flowers.
(14) He scratched his head and looked thoughtful.
(15) She's a very thoughtful person.
(16) They sat in thoughtful silence.
(17) Thank you. That's very thoughtful of you.
(18) Such thoughtful behaviour is the mark of a true gentleman.
(19) She's very thoughtful - the direct opposite of her sister.
(20) Thank you so much for my present. How thoughtful of you.
(21) It was really thoughtful of you to remember my birthday.
(22) It was very thoughtful of you to send the flowers.
(23) A simple question requiring a long and thoughtful answer.
(24) Paula's such a thoughtful girl.
(25) Without laws, thoughtful policy statements are merely well-meaning rhetoric.
(26) He's a sober, thoughtful, intelligent guy.
(27) Because today's your birthday ,because I love you so,because the happiness we share means more than I can show, because of little thoughtful things you so often do,with all my heart i'm wishing every happiness for you.Happy Birthday!
(28) You can find love in a smile or a helping hand, in a thoughtful gesture or a kind word. It is all around, if you just look for it.
(29) The review that I read said that it was 'a thoughtful and profound film'.
(30) Thank you for phoning when I was ill - it was very thoughtful of you.
More similar words: a thought, forethought, at the thought of, deep in thought, frightful, delightful, though, although, as though, even though, ought, thorough, throughout, sought, bought, thoroughly, brought, drought, ought to, through to, overwrought, nightfall, fretful, tactful, boastful, doubtful, wistfully, tactfully, deceitful, resentful.