Sad, listless, and without energy; acting in a gloomy way like someone who's given up on feeling better.
From 'mope,' which possibly comes from Scandinavian 'moppe' meaning 'to grumble.' The '-y' suffix makes it an adjective describing someone in that mood.
Depression and learned helplessness often make people 'mopey'—psychologists noticed that animals in similar situations become passive and sad, showing that giving up is a biological response, not a character flaw!
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