dunkelgrün
dark green
Describes a color that is a deep, rich green, closer to black than to yellow.
Für die Wanderung im Wald zog er seine dunkelgrüne Jacke an.
For the hike in the forest, he put on his dark green jacket.

dark green
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dark green
Describes a color that is a deep, rich green, closer to black than to yellow.
Für die Wanderung im Wald zog er seine dunkelgrüne Jacke an.
For the hike in the forest, he put on his dark green jacket.

The adjective is made up of 'dunkel' (dark) and 'grün' (green). This pattern (adverb/adjective + color) is very common in German for describing shades of color, for example also 'hellblau' (light blue) or 'tiefschwarz' (deep black).
Die Wände sind in einem beruhigenden Dunkelgrün gestrichen.
The walls are painted in a calming dark green.
When 'dunkelgrün' (dark green) comes before a noun, it is treated and declined like a single adjective. Only the ending of 'grün' changes; 'dunkel' remains unchanged.
Er trägt ein dunkelgrünes Hemd.
He is wearing a dark green shirt.
The color 'dunkelgrün' (dark green) is often associated with nature and clothing. Typical nouns are 'Wald' (forest), 'Blätter' (leaves), 'Augen' (eyes), 'Pullover' (sweater), or 'Jacke' (jacket).
Im Herbst färben sich die Blätter von dunkelgrün zu gelb und rot.
In autumn, the leaves change from dark green to yellow and red.