Thoughtful, solemn (7)

I believe the answer is:

serious

I believe this is a double definition.

'thoughtful' is the first definition.
(similar in meaning)

'solemn' is the second definition.
(similar in meaning)

(Other definitions for serious that I've seen before include "Important -- grave" , "Earnest - important" , "Important - solemn" , "Earnest; vital" , "Stern" .)

I've seen this clue in the Evening Standard.

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