unclean metal (e.g. dust, mud), especially when it is where it is not wanted (e.g. on the skin, clothes, in buildings)

grime, impurity

a dirty mass; obscene language, pictures etc

dirt, pollution

the decay of a part of the body because the supply of blood to it has been stopped

decay

the act of polluting; (a mixture of) substances that pollute

dirtiness, contamination