Pensive

1. adjective

   deeply or seriously thoughtful

   “Byron lives on not only in his poetry, but also in his creation of the 'Byronic hero' - the persona of a brooding melancholy young man”

   Similar: brooding, broody, contemplative, meditative, musing, pondering

2. adjective

   showing pensive sadness

   “the sensitive and wistful response of a poet to the gentler phases of beauty”

   Similar: wistful