Thoughtful (11)
There are a few possibilities for this:
considerate
'thoughtful' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for considerate that I've seen before include "Careful not to harm or inconvenience others" , "Showing care" , "Showing concern for the feelings of others" , "Thoughtful for the feelings of others" , "Unselfish" .)
'thoughtful' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for serious that I've seen before include "Earnest - important" , "Earnest, sincere" , "Important -- grave" , "Earnest; vital" , "Stern" .)
'thoughtful' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for pensive that I've seen before include "Introspective, maybe moody" , "in a brown study?" , "musing" , "Engaged in deep thought" , "Meditative" .)