Dirty (adjective)

1. Covered or marked with an unclean substance.
2. Having a dirty appearance or character.
3. Having a morally unclean or impure nature.
4. Having an impure or unclean aspect.
5. Having an impure or unclean character.

Origin:

Old english dreorig "miserable, dirty", of germanic origin; related to dreary.

Examples:

1. I need to wash these dirty clothes.
2. The room was dirty and needed to be cleaned.
3. She had dirty hands from working in the garden.
4. He had a dirty mind and was always thinking about inappropriate things.
5. The politics in this country are dirty and corrupt.