Wiktionary
unburnable
a. That is difficult or impossible to burn
Wikipedia
Unburnable
Unburnable, a novel published in 2006 by HarperCollins/Amistad, was written by the Caribbean author Marie-Elena John (born in Antigua), who was also an Africa Development specialist in New York and Washington, D.C. prior to turning to writing. Unburnable is her debut novel. It is historical fiction, a murder mystery, neo-slave narrative, and multi-generational saga.
Usage examples of "unburnable".
His unburnable possessions were melted beyond recognition before joining the bone balls, and drifted down through the water to the accompaniment of piscine burps and belches.