Which word could best represent a deceptive nature?

The word that best represents a deceptive nature is "guile." Guile refers to the use of clever and often deceptive tactics to achieve one's goals. It implies a level of cunningness, craftiness, or even trickery in how someone might manipulate a situation or other people. In contexts where deception is involved, guile captures the essence of being not straightforward, but rather employing subtle means to mislead or trick.

Other options present different meanings that do not align with the concept of deception. "Exemplary" describes something that is a model of excellence, which suggests honesty and integrity. "Clairvoyant" pertains to the ability to perceive things beyond the normal sensory contact, often linked to fortunetelling or insight, rather than deceit. "Integrity" refers to the quality of being honest and having strong moral principles, which directly contrasts with the idea of being deceptive. Hence, guile is the most fitting choice to represent a deceptive nature.