melancholia
/ˌmelənˈkəʊlɪə/noun
mass noun
1- deep sadness or gloom; melancholy抑郁, 忧郁：
rain slithered down the windows, encouraging a creeping melancholia.
雨水顺窗流下, 令人渐生郁闷。
1.1
- dated a mental condition marked by persistent depression and ill-founded fears〈旧〉抑郁症。
词源
late Middle English(denoting black bile)： from late Latin （see MELANCHOLY）.