Which of the following best describes someone who is "wily"?

A person described as "wily" embodies traits that are characterized by cleverness and often a degree of trickery. This term suggests a certain level of shrewdness and strategic thinking that can be both artful and cunning. The essence of being wily lies in the ability to navigate situations with a degree of craftiness, often bending rules or using deceit in a clever way to achieve goals.

In contrast, the other descriptors such as naive, innocent, upright, honest, predictable, and simple imply a straightforwardness or lack of guile that does not align with the concept of being wily. Such traits reflect an openness and transparency that is quite the opposite of the cunning nature implied by wily behavior, therefore making this choice the most appropriate selection for the word's meaning.