Noun

• S: (n) brooding, incubation (sitting on eggs so as to hatch them by the warmth of the body)
• S: (n) pensiveness, brooding (persistent morbid meditation on a problem)

Verb

• S: (v) brood, dwell (think moodily or anxiously about something)
• S: (v) brood, hover, loom, bulk large (hang over, as of something threatening, dark, or menacing) "The terrible vision brooded over her all day long"
• S: (v) sulk, pout, brood (be in a huff and display one's displeasure) "She is pouting because she didn't get what she wanted"
• S: (v) grizzle, brood, stew (be in a huff; be silent or sullen)
• S: (v) brood, hatch, cover, incubate (sit on (eggs)) "Birds brood"; "The female covers the eggs"

Adjective

• S: (adj) brooding, broody, contemplative, meditative, musing, pensive, pondering, reflective, ruminative (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"