Lutjanus adetii has a relatively deep body, which has a
standard length of 2.5 to 2.7 times its depth. The snout is rather pointed, the preorbital bone is wider than the diameter of the eye and there is a well developed preopercular protuberance and incision. The tongue has a patch of granular teeth while the vomerine teeth are arranged in a triangular patch. The
dorsal fin has 10 spines and 14 soft rays while the
anal fin contains 3 spines and 8 soft rays, these fins have a rounded posterior profile. The
pectoral fins contain 17 rays while the
caudal fin may be emarginate or slightly forked. The background colour is rosy-pink shading to silvery below with a dusky to golden stripe which runs from the middle of the operculum to the base of the caudal fin. There is a golden patch which surrounds the eye and runs onto the snout while the pectoral fin base has a yellow blotch, The dorsal and anal fins have white margins. The juveniles have a sizeable red spot on the
caudal peduncle, which some retain while the mid lateral stripe appears. This species attains a maximum
total length of , although is more typical. ==Distribution and habitat==