Shabby — much read (3-5)
I believe the answer is:
dog-eared
(Other definitions for dog-eared that I've seen before include "(Of pages) having corners turned down or worn" , "Agree odd description of book with bent pages (3-5)" , "Of book, with pages turned down at corners" , "Of book, with pages crumpled at the corners" , "Worn and shabby" .)