Brand New - New, unread, unused and in perfect condition with no missing or damaged pages.
Like New - Shiny, undamaged cover, dust jacket included for hard covers, no missing pages, all pages undamaged (no creases or tears), no underlining/highlighting of text, no damage to binding, no writing in margins (Could easily be mistaken for brand new)
Very Good - Doesn't look brand new but has no easily noticeable damage to the cover, dust jacket included for hard covers, no missing pages, all pages undamaged (no creases or tears), no underlining/highlighting of text, no writing in margins, very minimal identifying marks inside cover, very minimal wear and tear (You would give it to a good friend as a gift)
Good - Minimal damage to the cover (no holes or tears, only minimal scuff marks), dust jacket not necessarily included, minimal wear to binding, majority of pages undamaged (minimal creases or tears), minimal pencil underlining of text, no highlighting of text, no writing in margins, no missing pages (You would use it yourself, but wouldn't necessarily give it as a gift)
