Which adjective describes something that is difficult to catch or explain?

The adjective "elusive" accurately describes something that is difficult to catch or explain because it conveys the idea of being hard to grasp, define, or achieve. When something is elusive, it suggests that it is not easily attainable or comprehensible, often slipping away just when one thinks they are close to understanding or capturing it.

In various contexts, such as in discussions about concepts, ideas, or even physical entities, using "elusive" communicates that there is a level of complexity or fleeting nature to what is being discussed. For example, elusive concepts in philosophy often require deep contemplation and are not straightforward or easily articulated.

While "evasive" can also imply difficulty in understanding or grasping something, it typically refers to avoiding something directly, such as a question or a situation. The term "elderly" is unrelated to the concept of difficulty in catching or explaining, as it simply denotes age. "Explicit," on the other hand, signifies clarity and straightforwardness, which contrasts with the idea of something being difficult to explain. Thus, "elusive" stands out as the most fitting adjective in this case.