1. A feeling of sadness, despair, or hopelessness; a state of deep melancholy or emotional decline
After hearing the bad news, she fell into a sinking mood and didn't want to talk to anyone.
Depois de ouvir a má notícia, ela caiu num humor depressivo e não queria falar com ninguém.
2. A sense of anxiety or dread about the future; anticipatory sadness
He had a sinking mood as he contemplated the difficult decision ahead.
Ele tinha um humor depressivo enquanto contemplava a decisão difícil que se aproximava.