"Covinous" is a word in ENGLISH

A secret agreement and cooperation for a fraudulent or deceitful purpose; a playing into each other's hands; deceit; fraud; cunning.

A deceitful agreement br compact between two or more persons, for the one party to bring an action against the …

Any trick, collusion, contrivance, false representation, or underhand practice, used to defraud another. When injury is thereby effected, an action …