What describes excessive enthusiasm for an object or idea?

The term that describes excessive enthusiasm for an object or idea is "fetish." In this context, a fetish refers to an intense, disproportionate obsession or fixation on a specific object, concept, or even an activity, often elevating its significance beyond what might be considered typical or healthy. This enthusiasm is often manifest in a way that reflects a deeper emotional or psychological attachment to the object or idea, which can lead to a focused, sometimes irrational level of interest.

Understanding why "fetish" is the most accurate choice involves recognizing the distinction between it and other terms that might imply strong feelings or skills, but do not capture the same nuance of obsession. For instance, the idea of "ferocity" usually conveys a sense of fierce intensity or aggression, which does not directly translate to enthusiasm. "Finesse" relates to skillfulness and delicacy in handling situations, while "fixation" suggests an obsession but lacks the connotation of a specific emotional attachment that "fetish" embodies. Therefore, "fetish" most accurately encapsulates the notion of an excessive enthusiasm rooted in deep personal investment.