Superficial is an adjective that describes something that is lacking in depth or solidity, or that is concerned only with surface aspects or obvious features. Here are some key points to keep in mind:

• Superficial can refer to something that is located near the surface, lying on, not penetrating below, or affecting only the surface.
• It can also describe someone who is not interested in thinking seriously about anything, even important matters.
• Superficial can be used to describe something that is concerned only with the obvious or apparent, seen on the surface, or presenting only an appearance without substance or significance.
• It can also refer to something that is not complete, or that has a false appearance.
• Superficial can have a negative connotation, suggesting that something or someone is shallow, lacking in depth, or cares too little about meaningful things.

Overall, superficial is a term that is often used to describe something that is lacking in depth or substance, or that is only concerned with surface appearances.