Smaug lay, with wings folded like an immeasurable bat, turned partly on one side, so that the hobbit could see his underparts and his long pale belly crusted with gems and fragments of gold from his long lying on his costly bed.
There are no more uses of "immeasurable" in the book.
Show samples from other sources
"While I’m sure we’re all immeasurably relieved that you’ll be looking after the Blackthorn children," said Luke, "Helen is one of them.
Cassandra Clare -- City of Heavenly Fire
I settled into rituals, which improved the quality of my existence immeasurably.