What is the best definition for the word superficial?

The term "superficial" primarily refers to something that is related to or situated on the surface. This definition captures the essence of the word, which is often used to describe things that lack depth or substance, whether in a physical sense or in a more metaphorical context, such as superficial knowledge or relationships. The focus is on the outer layer rather than any deeper qualities or characteristics.

In this context, the other options do not align with the definition of "superficial." "Backward" refers to something that is behind in progress or direction, "awkward" implies a lack of grace or ease, and "intense" indicates a high degree of strength or force. None of these meanings corresponds to the surface-level connotation of "superficial," reinforcing that the most suitable definition is indeed related to the surface.