secretly acting together for a fraudulent or illegal purpose
Sly; crafty; clever in surreptitious behaviour.
The natural wit or instincts of an animal.
The disposition to employ one's skill in an artful manner; craftiness; guile; artifice; skill of being cunning, sly, conniving, or deceitful.
Practical knowledge or experience; aptitude in performance; skill, proficiency; dexterity.
Practical skill employed in a secret or crafty manner; craft; artifice; skillful deceit; art or magic.