'Gloomy' in the Bible

As a shepherd cares for his herd in the day when he is among his scattered sheep, so I will care for My sheep and will deliver them from all the places to which they were scattered on a cloudy and gloomy day.

“Whenever you fast, do not put on a gloomy face as the hypocrites do, for they neglect their appearance so that they will be noticed by men when they are fasting. Truly I say to you, they have their reward in full.