What might be a characteristic of someone described as wily?

Describing someone as wily suggests that they possess a cleverness that is often accompanied by cunning or a capacity for deception. This term typically implies a tendency to manipulate situations or individuals to their advantage, often employing shrewd tactics. A wily individual might use their intelligence in a crafty manner, which differentiates them from someone who is honest or straightforward.

In contrast, the other choices present characteristics of individuals who are more transparent and genuine, lacking the sly and deceptive qualities that define wily behavior. Therefore, the identification of "sly and deceitful" as a characteristic aligns perfectly with the connotation of being wily.