unputdownableness means the quality of being unputdownable. Lexicurio rates it Sui generis — a strength score of 95 out of 100.
noun
- The quality of being unputdownable.“Although competently written, the book left me dissatisfied. “Count-Down” isn’t plausible in the way that good sf [science fiction] should be. It has not got the compelling mystery of good fantasy nor the unputdownableness of a good thriller.”