n. 25B6; verb
it's no use moping : BROOD, sulk, be miserable, be despondent, pine, eat one's heart out, fret, grieve; informal be down in the dumps/mouth; poetic/literary repine.
she was moping about the house : LANGUISH, moon, idle, loaf; Brit. informal mooch; N. Amer. informal lollygag.
25B6; noun she's regarded as a mope : MELANCHOLIC, depressive, pessimist, killjoy; informal sourpuss, party-pooper, spoilsport, grouch, grump; Brit. informal misery.