[3][4] The generic name Nimbochromis is a combination of the Latin word nimbus and Greek chromis[2] Thus the genus could be translated as "clouded chromis", alluding to the fish's distinctive dark mottling (or "clouded" pattern) on white base coloration.

The dorsal fin may be blue while maintaining an orange to red band and sometimes a white line.

Breeding males turn a dark blue which almost completely obscures their blotched pattern.

Females are similar, but usually lack the yellow "egg spot" markings on the anal fin.

Wild and Aquarium specimens have been observed to lie on the substrate as if dead, waiting for small fish to come close in search of a meal; the distinctive colouration of this species is said to mimic that of a dead fish, and may aid its disguise.