melancholy

causing or expressing sadness; depressing

Merriam-Webster Online Dictionary
melancholy (noun)
1.
a) an abnormal state attributed to an excess of and characterized by irascibility or depression - black bile
b) - black bile
c) - melancholia
2.
a) depression of spirits - dejection
b) a mood - pensive
melancholy (adjective)
1.
a) suggestive or of sadness or depression of mind or spirit - expressive sang in a melancholy voice
b) causing or tending to cause sadness or depression of mind or spirit - dismal a melancholy thought
2.
a) depressed in spirits - dejected sad
b) - pensive