Oh! But he was a tight-fisted hand at the grind-stone, Scrooge! A squeezing, wrenching, grasping, scraping, clutching, covetous old sinner!
-Metaphor representing scrooges old fashioned ways (Grindstone is old for Victorians)
-He has not evolved emotionally or morally
-Covetous has religious connotations (Thou shalt not covet) suggesting Scrooge isn't religious and knows he is sinning and continues to do so.
-Scrooge is presented as the antithesis of generosity
-7 adjectives listed could represent 7 deadly sins