This is the 14917th most frequent German word.
rotbraunen
Reddish-brown.
Here, 'rotbraune' is an attributive adjective modifying 'Jacke' to indicate its color.
Ich habe eine rotbraune Jacke gekauft.
I bought a reddish-brown jacket.
In this sentence, 'rotbraunes' is an attributive adjective describing the color of the dog's coat.
Der Hund hat ein rotbraunes Fell.
The dog has a reddish-brown coat.
In this sentence, 'rotbraunen' is an attributive adjective describing the color of the leaves.