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1.
Adjective meaning consistently and irresistibly interesting. Typically refers to a book that is so well written and entertaining as to be difficult to (literally) put down and pause away from.
Have you read the latest Harry Potter? It's unputdownable.
by Count3D July 21, 2007
 
2.
having the ability of being unable to put down - comulsive really.
"Richard Hammond's new book is unputdownable, 'tis quite frankly awesome"
by Moogly October 18, 2007
 
3.
Books that are so incredibly good or entertaining that you can't put them down.
The Harry Potter books are unputdownables
by Unputdownables Creator May 18, 2011