dirty
adjective
uk/ˈdɜːti/ usunfair or dishonest:
The rival company's dirty tricks campaign had cost it many millions of pounds.
a dirty campaign/business
dirty dealings/politics/tactics
ENVIRONMENT
containing dangerous substances that may be harmful to the environment:
dirty air
dirty coal plants
do sb's dirty work
to do something unpleasant or difficult for someone because they do not want to do it themselves:
The building societies have done the chancellor's dirty work for him, by cutting the cost of a mortgage in anticipation of a base rate cut.
quick and dirty
produced quickly and without spending much money:
Developers make quick and dirty versions of the final product so that the client can interact with it and provide feedback.