Adjective
Of a person, etc.: difficult or impossible to put down (in various senses).
(specifically) Of a book or other written work: so captivating or engrossing that one cannot bear to stop reading it.
Synonym: page-turning
Antonyms: putdownable, put-downable
Book 1 of the Ronan trilogy is officially unputdownable and 100% approved by Stiefvater Senior. Source: Internet
It can only be the unputdownable stories we've been reading at Econsultancy this week. Source: Internet
"Lisa Black wows us with another tense and unputdownable thriller. Source: Internet
Full of I-didn't-know-that facts, this nonfiction book proved almost unputdownable. Source: Internet
"Fun, fresh and unputdownable. Source: Internet
This book is unputdownable. Source: Internet