thoughtful
thought-ful
adjective
Engaged in deep thought; appearing reflective or pensive.
"He sat in thoughtful silence."
adjective
Showing care and consideration for the needs and feelings of others.
"It was very thoughtful of you."
Thesaurus
Synonyms: heedful, paying attention, attentive, serious-minded, serious, considerate, profound, brooding, deliberative, excogitative, lost, pensive
Antonyms: heedless, thoughtless, unheeding