coal-black

US /ˈkoʊl.blæk/
UK /ˈkoʊl.blæk/
"coal-black" picture
1.

kohlschwarz, pechschwarz

of the deepest black color; extremely dark

:
Her long, flowing hair was coal-black.
Ihr langes, wallendes Haar war kohlschwarz.
The night sky was coal-black, with no moon visible.
Der Nachthimmel war kohlschwarz, ohne sichtbaren Mond.