na-adjective, noun which may take the genitive case particle 'no', noun
dark-skinned; swarthy
Describes a person's complexion as dark or tanned. Can be neutral or slightly negative depending on context; 色黒 is the most common term for this concept.
He is dark-skinned and has a sturdy build.
I got really tanned over the summer.
色白 describes naturally pale or fair skin, while 色黒 describes dark or tanned skin.
Compound of 色 (color, complexion) and 黒 (black). The reading いろぐろ is a straightforward combination of the kun'yomi readings.