(usually in the plural) A surface detail.

An adjective "superficial" describes something that exists, occurs, or is located on the surface, particularly in relation to the body or skin.

Appearing to be true or real only until examined more closely.

An adjective "superficial" describes something that is not thorough, deep, or complete, and is only concerned with the obvious or apparent, lacking depth of character or understanding.

(rare) Two-dimensional; drawn on a flat surface.

(Britain, architecture) Denoting a quantity of a material expressed in terms of area covered rather than linear dimension or volume.