pensive
https://www.merriam-webster.com/dictionary/pensive
pensive
adjective
pen·sive ˈpen(t)-siv
Synonyms of pensive
1
: musingly or dreamily thoughtful
a pensive young poet
2
: suggestive of sad thoughtfulness
her face had the pensive mournfulness of a seraph in an old sad painting
—Herman Wouk
pensively adverb
pensiveness noun
Synonyms
broody
cogitative
contemplative
meditative
melancholy
musing
reflective
ruminant
ruminative
thoughtful