Definitions of superficial:

• adjective:   being or affecting or concerned with a surface; not deep or penetrating emotionally or intellectually

  Example: "Superficial similarities"

• adjective:   of little substance or significance

  Example: "A few superficial editorial changes"

• adjective:   relating to a surface

  Example: "Superficial measurements"

• adjective:   involving a surface only

  Example: "Superficial bruising"