Quote:
Originally Posted by chitrodhar
I wonder if you made up that word, as I have never heard it before 
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It's a back formation sort of like 'gruntled'
(OED)
unputdownable adj.
1947 R. Chandler Let. 5 Jan. in R. Chandler Speaking (1966) 66, I found it absolutely..unputdownable.
1982 Brit. Med. Jrnl. 15 May 1466/2 The novel is highly readable and quite unputdownable.
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Compare 'unswitchoffable'