melancholy
/ˈme-lən-ˌkä-lē/
noun
depression of spirits : dejection
a pensive mood
melancholia
great outbursts of creativity alternate with feelings of extreme melancholy
a fine romantic kind of a melancholy on the fading of the year
adjective
suggestive or expressive of sadness or depression of mind or spirit
causing or tending to cause sadness or depression of mind or spirit : dismal
sang in a melancholy voice
a melancholy thought