Antinomianism comes from the Greek meaning lawless. In Christian theology it is a pejorative term for the teaching that Christians are under no obligation to obey the laws of ethics or morality. Few, if any, would explicitly call themselves "antinomian," hence, it is usually a charge leveled by one group against an opposing group.
Antinomianism may be viewed as the polar opposite of legalism, the notion that obedience to a code of religious law is necessary for salvation. In this sense, both antinomianism and legalism are considered errant extremes.