The light grew no stronger, for Orodruin was still belching forth a great fume that, beaten upwards by the opposing airs, mounted higher and higher, until it reached a region above the wind and spread in an immeasurable roof, whose central pillar rose out of the shadows beyond their view.
One moment only it stared out, but as from some great window immeasurably high there stabbed northward a flame of red, the flicker of a piercing Eye; and then the shadows were furled again and the terrible vision was removed.
A brief vision he had of swirling cloud, and in the midst of it towers and battlements, tall as hills, founded upon a mighty mountain-throne above immeasurable pits; great courts and dungeons, eyeless prisons sheer as cliffs, and gaping gates of steel and adamant: and then all passed.
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.