2. The description of one's actions being like that of a bastard
Chris bastardly chastised Dan for his inadequate performance even though he didn't deserve it.
verb: A combination of Dastardly and Bastard, whereby the actions of an individual or group constitute bastard like proportions of dastardly behavior. Premeditated and planned complex screwing over.
In the game Soyoban (Cat Mario), many of the levels included gimmicks and expert scenarios which made them bastardly to complete.