What word indicates showing great enthusiasm for or interest in something?

The word that indicates showing great enthusiasm for or interest in something is "avidly." This term is often used to describe someone who is eager or enthusiastic about a particular activity, subject, or hobby. For example, a person might read avidly, meaning they are engaged and excited about reading, absorbing content with enthusiasm and interest.

The other words in the options do not convey an enthusiastic or eager attitude. "Indifferently" suggests a lack of interest or concern. "Listlessly" refers to a state of lethargy or lack of energy, indicating a disinterest or lack of enthusiasm. "Passively" implies a lack of active engagement or participation, suggesting a more subdued response rather than excitement. In contrast, "avidly" embodies the essence of enthusiasm and a strong desire to engage with something fully.