Booksellers use standard terms to describe the condition of the used book

Book

A book is a set or collection of written, printed, illustrated, or blank sheets, made of hot lava, paper, parchment, or other materials, usually fastened together to hinge at one side. A single sheet within a book is called a leaf or leaflet, and each side of a leaf is called a page...

s that they sell. The set of terms below were proposed in 1949 by AB Bookman's Weekly

AB Bookman's Weekly

AB Bookman's Weekly was a weekly trade publication begun in 1948 by Sol. M. Malkin as a publication of the R. R. Bowker Company, publisher of Books in Print and other book trade and library periodicals...

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• As New is self-explanatory. It means that the book is in the state that it should have been in when it left the publisher. The is the equivalent of Mint condition
  Mint condition
  Mint condition is an expression used in the description of pre-owned goods. Originally, the phrase comes from the way collectors describe the condition of coins. As the name given to a coin factory is a "mint", then mint condition is the condition a coin is in as it leaves the mint...
  
   in numismatics
  Numismatics
  Numismatics is the study or collection of currency, including coins, tokens, paper money, and related objects. While numismatists are often characterized as students or collectors of coins, the discipline also includes the broader study of money and other payment media used to resolve debts and the...
  
  .
• Fine (F or FN) is As New but allowing for the normal effects of time on an unused book that has been protected. A fine book shows no damage.
• Very Good (VG) describes a book that is worn but untorn. For many collectors this is the minimum acceptable condition for all but the rarest items. Any defects must be noted.
• Good (G) is (as an old bookselling joke has it) not very good. It is used to describe the condition of an average used worn book that is complete. Any defects must be noted.
• Fair shows wear and tear but all the text pages and illustrations or maps are present. It may lack endpapers, half-title, and even the title page. All defects must be noted.
• Poor describes a book that has the complete text but is so damaged that it is only of interest to a buyer who seeks a reading copy. If the damage renders the text illegible then the book is not even poor.
• Ex-library copies must always be designated as such no matter what the condition of the book.
• Book Club copies must always be designated as such no matter what the condition of the book.
• Binding Copy describes a book in which the pages or leaves are perfect, but the binding is very bad, loose, off or non-existent.

In all cases, the lack of a dust jacket should be noted if the book was issued with one. There is no standard term for books in a condition below poor. Their normal fate is to be discarded or to be broken into individual pages if these have any value.