pejorative

pejorative \pih-JOR-uh-tiv\, adjective:

1. Tending to make or become worse.
2. Tending to disparage or belittle.
3. A belittling or disparaging word or expression.

Citing the construction industry, car dealers, and politicians as the purveyors of "sprawl" (a pejorative term that does not even allow for the possibility of benefits associated with low-density development), Kunstler fails to consider the role of market forces.
-- Julia Hansen, "letter to the editor", The Atlantic, December 1996

While he said that he is not a "fanboy," mildly pejorative slang for an aggressively obsessive "Star Wars" fan, he did mention that the John Williams "Star Wars" theme was played at his wedding reception two years ago.
-- Michel Marriott, "On a Galaxy of Sites, 'Star Wars' Fever Rises", New York Times, May 6, 1999

Welfare state is now, even for the Labour party whose grand historic achievement it was, obscurely shameful. A pejorative for our times.
-- John Sutherland, "How the potent language of civic life was undermined", The Guardian, March 20, 2001

Pejorative is derived from the past participle of Late Latin pejorare, "to make worse, to become worse," from Latin pejor, "worse."