brooding

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
    

Noun

• persistent morbid meditation on a problem

• sitting on eggs so as to hatch them by the warmth of the body

Related words

• Synonyms: 
  broody , contemplative , meditative , musing , pensive , pondering , reflective , ruminative , pensiveness , incubation