Which word best describes someone who is independent in behavior or thought?

The word "maverick" accurately captures the essence of someone who is independent in behavior or thought. A maverick is typically associated with a person who exhibits unconventional behavior or holds independent opinions that may diverge from the norm. This term conveys a spirit of individuality and a willingness to stand apart from the crowd, making it the best choice in this context.

In contrast, a recluse refers to someone who prefers isolation and may not necessarily reflect independence in thought or behavior in a positive sense. Perennial denotes something enduring or lasting, often used in relation to plants or concepts that repeat over time, but it lacks the connotation of independence. Superfluous means unnecessary, especially through being more than enough, which does not relate to independence at all. Thus, the choice of "maverick" stands out as the most appropriate descriptor of independent behavior or thought.