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.