Definition of grimy:
dirty (part of speech: verb)
- study at dirty
unclean (part of speech: adjective)
- "Blindfolded", Earle Ashley Walcott.
- "The Man Upstairs and Other Stories", P. G. Wodehouse.
Folding his arms, which were almost too short to fold, he stood before the single window, gazing through its grimy glass at the brick wall opposite, as though determined to find something cheerful in the outlook.- "Explorers of the Dawn", Mazo de la Roche.