A contrivance or device may be either good or bad. A cheat is a mean advantage in a bargain; a fraud, any form of covert robbery or injury. Imposture is a deceitful contrivance for securing charity, credit, or consideration. A stratagem or maneuver may be of the good against the bad, as it were a skilful movement of war. A wile is usually but not necessarily evil.

A trick is often low, injurious, and malicious; we say a mean trick; the word is sometimes used playfully with less than its full meaning. A ruse or a blind may be quite innocent and harmless. An artifice is a carefully and delicately prepared contrivance for doing indirectly what one could not well do directly. A device is something studied out for promoting an end, as in a mechanism; the word is used of indirect action, often, but not necessarily directed to an evil, selfish, or injurious end. Finesse is especially subtle contrivance, delicate artifice, whether for good or evil. Compare FRAUD.