Lugubrious (adjective)

Excessively or affectedly sad; melancholy; mournful.

Origin:

From latin lugubris meaning "mournful" or "sad".

Examples:

1. He had a lugubrious expression on his face.
2. The funeral was a lugubrious affair.
3. The lugubrious atmosphere in the room was palpable.
4. He always had a lugubrious attitude, it was hard to be around him.
5. She gave a lugubrious performance in the play.