Which word describes someone who is extremely interested in something?

The word "avid" is used to describe someone who is extremely interested or enthusiastic about something. It conveys a sense of eagerness and passion, often implying an intense desire or enthusiasm for a particular subject or activity. For example, an avid reader is someone who has a strong love for books and spends a lot of time reading. This term effectively captures the notion of a person who not only has interest but also a deep commitment and fervor towards their pursuits.

In contrast, the other options do not convey the same level of enthusiasm. "Awry" refers to something that is twisted or out of place, "benign" indicates something that is gentle or kindly, often used in a medical context to mean non-threatening, and "blasé" describes someone who is indifferent or unimpressed due to familiarity or overexposure. None of these align with the idea of strong interest or enthusiasm, making "avid" the most appropriate choice.