Which word best describes someone who shows keen interest and enthusiasm?

The term "avid" is particularly suitable to describe someone who displays a keen interest and enthusiasm. This word conveys a sense of eagerness and intense interest in a specific subject or activity, indicating that the person is not just casually interested but deeply passionate and actively engaged.

In the context of different attributes, "avid" encapsulates an enthusiasm that often drives individuals to pursue their interests with vigor and devotion, making it the ideal choice here. For instance, an avid reader immerses themselves in books and literary discussions, reflecting their profound passion.

Other options represent different traits that do not align with the idea of keen interest and enthusiasm. "Astute" refers to someone who is perceptive and able to make good judgments, which is more about intelligence than enthusiasm. "Astringent" describes a substance that constricts or unpleasantly sharp in taste, which doesn't relate to enthusiasm at all. "Audacious" characterizes someone who is bold or daring, but this boldness does not specifically imply interest or passion, making it less suitable in this context.

Hence, "avid" stands out as the best descriptor for someone who exhibits both interest and enthusiasm.