adjective

covered with dirt; grimy.

the grubby face of a young boy

dirty,grimy,filthy,unwashed,stained,soiled,smeared,spotted,muddy,dusty,sooty,messy,scruffy,shabby,untidy,unkempt,slovenly,slatternly,sordid,squalid,unhygienic,unsanitary,insanitary,mucky,cruddy,yucky,icky,manky,grotty,gungy,bogging,befouled,besmirched,besmeared,begrimed,feculent