UNDERHAND adv. 4 definitions
t means; in a clandestine manner; hence, by fraud; unfairly. Such mean revenge, committed underhand. Dryden. Baillie Macwheeble provided Janet, underhand, with meal for their maintenance. Sir W. Scott.
DECEIT n.
Any trick, collusion, contrivance, false representation, or underhand practice, used to defraud another. When injury is thereby effected, an action of deceit, as it called, lies for compensation.