insanable
Not capable of being healed, incurable, irremediable.
[…] by the Cirrhæan spikes, by the boiled head of my own baby served in Egyptian vinegar, I curse the whole insanable cacoëthical cohort of scriptitating—
Where it comes from
From Latin īnsānābilis. Compare Old French insanable. See in- (“not”) + sanable.
Adapted from the Wiktionary entry insanable (CC BY-SA 4.0).