Wiktionary
grubbier
a. (en-comparative of: grubby)
WordNet
grubbier
See grubby
grubby
Usage examples of "grubbier".
The Demons: one of the larger bands of street toughs who ran wild in the grubbier areas of the city.
After two days and nights of more or less continuous driving, the boy was no whit damper or grubbier than before, and Farrell was no nearer to remembering whether his name was Pierce Harlow or Harlow Pierce.