What term is used to describe something that is merely touching or slightly connected?

The term that accurately describes something that is merely touching or slightly connected is "tangential." This word originates from the mathematical concept of a tangent, which refers to a line that touches a curve at a single point without crossing it. In a more general context, "tangential" is used to describe ideas, discussions, or connections that are not closely related or that only touch upon a subject in a minor or peripheral way. This conveys the notion of a weak or indirect association rather than a strong or principal connection.

In contrast, "superficial" typically refers to things that are shallow or lacking in depth, which may not necessarily imply a touch or slight connection. "Tangible" is used to describe something that can be perceived by touch or is definite and real, and does not fit the notion of slight connection. "Incidental," on the other hand, relates more to something that occurs by chance rather than being closely related or connected, making it distinct from the idea of something being only slightly connected.