What is what does sly mean?

The word sly is often used to describe someone who is cunning, deceitful, or sneaky. It can also refer to someone who is clever or resourceful in a way that is not always honest or fair. Sly behavior involves being skillful in manipulating others or situations for one's own benefit. The term can also be used to describe a subtle or devious sense of humor. In general, being sly is associated with qualities such as guile, trickery, and cunningness.