brooding (adj.) Look up brooding at Dictionary.com
1640s, "hovering, overhanging" (as a mother bird does her nest), from present participle of brood (v.); meaning "that dwells moodily" first attested 1818 (in "Frankenstein").
brooding (n.) Look up brooding at Dictionary.com
"action of incubating," c.1400, verbal noun from brood (v.). Figuratively (of weather, etc.) from 1805; of mental fixations by 1873. Related: Broodingly.