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An "avid" person is best characterized as being enthusiastic and eager. This term conveys a strong sense of passion and intense interest in something, often suggesting a deep commitment or enthusiasm towards an activity, hobby, or pursuit. For instance, an avid reader would be someone who reads frequently and finds great joy in the act of reading, often pursuing it with enthusiasm.

This understanding aligns with the root meaning of the word "avid," which comes from the Latin "avidus," meaning greedy or desirous. The characteristic of eagerness implies a proactive approach towards engaging in activities that interest them, making it distinctly positive.

The other choices do not align with the meaning of "avid." Indifference to experiences would suggest a lack of interest; being wooden or stiff implies a lack of enthusiasm or flexibility, which contradicts the concept of being eager; while being both amused and irritated is unrelated to the singular focus on enthusiasm that "avid" denotes. Thus, the correct answer effectively reflects the energetic and passionate nature associated with an avid individual.