—v.intr. be gloomily depressed or listless; behave sulkily.
—n.
1 a person who mopes.
2 (the mopes) low spirits.
Derivatives:
moper n. mopy adj. (mopier, mopiest). mopily adv. mopiness n.
Etymology: 16th c.: prob. rel. to mope, mopp(e) fool
Useful english dictionary. 2012.