melancholia
noun /ˌmelənˈkəʊliə/
/ˌmelənˈkəʊliə/
(old-fashioned)- a mental illness in which the patient is depressed and worried by unnecessary fearsTopics Illnessc2Word Originlate Middle English (denoting black bile): from late Latinfrom Greek melankholia, from melas, melan- ‘black’ + kholē ‘bile’, an excess of which was formerly believed to cause depression.