| noun | sitting on eggs so as to hatch them by the warmth of the body |
| noun | persistent morbid meditation on a problem |
| verb | think moodily or anxiously about something |
| verb | hang over, as of something threatening, dark, or menacing “The terrible vision brooded over her all day long” |
| verb | be in a huff and display one's displeasure “She is pouting because she didn't get what she wanted” |
| verb | be in a huff; be silent or sullen |
| verb | sit on (eggs) “Birds brood” |
| 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” |
| incubate | verb | sit on (eggs) |
| pensive | adjective | deeply or seriously thoughtful |
| sulk | noun | a mood or display of sullen aloofness or withdrawal |
| pouter | noun | someone with a habitually sullen or gloomy expression |
| stew | noun | agitation resulting from active worry |
| brood | noun | the young of an animal cared for at one time |
| brooder | noun | apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants |
| hatch | noun | the production of young from an egg |
| incubation | noun | sitting on eggs so as to hatch them by the warmth of the body |
| incubator | noun | apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants |
| contemplate | verb | reflect deeply on a subject |
| contemplativeness | noun | deep serious thoughtfulness |
| meditativeness | noun | deep serious thoughtfulness |
| meditate | verb | think intently and at length, as for spiritual purposes |
| pensiveness | noun | persistent morbid meditation on a problem |
| reflectivity | noun | the capability of quiet thought or contemplation |
| reflect | verb | reflect deeply on a subject |
| ruminate | verb | reflect deeply on a subject |