healless

Etymology

From Middle English heleles, equivalent to heal (“health, well-being”) + -less. Compare healful.

adj

1. Incapable of being made whole or well; cureless; incurable; unhealable.
   […] the hour that Wrung its idol from its core, and left it Bleeding with a healless wound, nor power On earth to staunch and stop the same; […] 1842, John Snowden Hopkins, The poetical works of John Snowden Hopkins
   A capacity for sin so healless that it makes its man despair from his heart of redemption - that is the true theological way to salvation. 2010, Friedrich Ohly, Linda Archibald, George Steiner, The Damned and the Elect: Guilt in Western Culture