Dictionary:

broody

  (brū'dē)

1. 1. Meditative; contemplative.
   2. Oppressive: “The room's air was broody and sullen, like the season's own, full of storm clouds” (Nicholas Proffitt).
2. Disposed to sit on eggs to hatch them: a broody hen.

The noun has one meaning:

Meaning #1: a domestic hen ready to brood
  Synonyms: brood hen, broody hen, setting hen, sitter

The adjective broody has 2 meanings:

Meaning #1: physiologically ready to incubate eggs

Meaning #2: persistently or morbidly thoughtful
  Synonyms: brooding, contemplative, meditative, musing, pensive, pondering, reflective, ruminative