Covered or marked with an unclean substance. The children came back from the park with dirty clothes.
Morally unclean or corrupt. The politician was known for his dirty tactics during the campaign.
Involving or characterized by dishonesty or corruption. The company was involved in a dirty deal that led to a scandal.
Obscene or indecent, especially in a sexual context. The comedian was known for his dirty jokes.
Unpleasant or undesirable, often used to describe weather or conditions. The team had to play in dirty weather, with rain and strong winds.