brooding
brood-ing
adjective
Deeply thoughtful, often in a sad, worried, or menacing manner.
"He sat in a brooding silence."
adjective
Dark, menacing, or threatening in appearance or atmosphere.
"Brooding clouds gathered overhead."
Thesaurus
Synonyms: pensiveness, incubation, broody, thoughtful, pondering, meditative, contemplative, reflective, musing, ruminative, pensive