unsmeltable en · ADJ
Etymology
From un- + smeltable.
Meanings
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(not-comparable) Not smeltable.
The curtain wall our guild was to help defend was ruinous even then, with a wide gap between the Red Tower and the Bear, where I used to climb the fallen slabs of unsmeltable gray metal to look out over the necropolis that descends that side of Citadel Hill.
1980, Gene Wolfe, chapter 2, in The Shadow of the Torturer (The Book of the New Sun; 1), New York: Simon & Schuster, →ISBN, pages 19–20: