
düster
gloomy
Very dark, poorly lit, or covered with dark clouds.
An dem düsteren Novembertag wurde es schon am Nachmittag dunkel.
On that gloomy November day, it was already getting dark in the afternoon.
gloomy
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gloomy
Very dark, poorly lit, or covered with dark clouds.
An dem düsteren Novembertag wurde es schon am Nachmittag dunkel.
On that gloomy November day, it was already getting dark in the afternoon.

gloomy
Seeming pessimistic, threatening, or sad. Refers to moods, prospects, or thoughts.
Nach der Niederlage war die Stimmung in der Umkleidekabine düster.
After the defeat, the mood in the locker room was gloomy.

sinister
Creepy, shady, or morally questionable.
Er ist eine düstere Gestalt mit einer undurchsichtigen Vergangenheit.
He is a sinister figure with an opaque past.
The noun that 'düster' (gloomy/sinister) describes reveals the meaning. If it refers to light or a place, it means 'dark'. If it refers to feelings or abstract ideas, it means 'pessimistic'. If it refers to a person or their actions, it means 'creepy' or 'sinister'.
Wir gingen durch einen düsteren Korridor.
We walked through a gloomy corridor.
In the literal meaning 'dark', 'düster' (gloomy) is often used for places, the weather, or the time of day. Typical combinations are: ein düsterer Wald (a gloomy forest), eine düstere Gasse (a gloomy alley), ein düsterer Himmel (a gloomy sky), or ein düsterer Tag (a gloomy day).
Die Geschichte spielt in einer düsteren Burg im Mittelalter.
The story is set in a gloomy castle in the Middle Ages.
For the figurative meaning 'pessimistic', 'düster' (gloomy) is combined with abstract nouns. Common ones are: eine düstere Stimmung (a gloomy mood), düstere Gedanken (gloomy thoughts), eine düstere Prognose (a gloomy forecast), or düstere Aussichten (gloomy prospects).
Trotz der Krise hat er keine düsteren Gedanken.
Despite the crisis, he has no gloomy thoughts.
When 'düster' (sinister) describes a person or their character, it means 'creepy' or 'shady'. People then speak of eine düstere Gestalt (a sinister figure), eine düstere Vergangenheit (a sinister/dark past), or düstere Machenschaften (sinister dealings, plural).
Niemand wusste etwas über seine düstere Vergangenheit.
Nobody knew anything about his dark past.
black
Schwarz and düster can describe a negative or ominous future. Schwarz presents it figuratively and often colloquially, while düster places more emphasis on the oppressive, threatening mood. Use schwarz for a figurative judgment and düster when the poor outlook itself is the focus.

Nach den neuen Zahlen wirkt die Zukunft des Vereins düster.
After the new figures were released, the club's future looked gloomy.
Der Kommentator sieht für den Verein eine schwarze Zukunft.
The commentator sees a bleak future for the club.