Superficial (adjective)

1. Relating to or occurring on the surface.
2. Not deep or penetrating emotionally or intellectually.
3. Not thorough or complete.

Origin:

Late 16th century: from latin superficialis, from superficies, superficiem "surface", from super- "above" + facies "face, appearance".

Examples:

1. The wound is only superficial, it doesn't require stitching.
2. The explanation given was superficial, I couldn't understand it.
3. He had a superficial knowledge of the subject.
4. The relationship was only superficial, they didn't have any real connection.
5. The review of the book was superficial, it didn't go into detail.