mope 
(mōp)
(mōp)intr.v. moped, mop·ing, mopes
1. To think gloomily and persistently about something; be dejected. See Synonyms at brood.
2. To move in a listless or aimless manner, especially from being sad or depressed: moped about the house all summer.
n.
1. A person given to gloomy or dejected moods.
2. mopes Low spirits; the blues. Often used with the.
[Origin unknown.]
moper n.
mopish, mopey adj.
mopish·ly adv.