Brooding, dwelling upon one's thoughts; moody.
Of birds: sitting persistently and protectively on a nest, in order to hatch eggs.
Of any creature or person: showing an interest in raising young.
Gloomy.
A female bird in the condition to incubate eggs; a broody hen, duck, etc.
Having the appearance of deep, often melancholic, thinking.
Looking thoughtful, especially from sadness.