incurable

What it means

1. not comparableOf an illness, condition, etc, that is unable to be cured; healless.

   They were labouring under a profound, and, as it might have seemed, an almost incurable ignorance.

   1854, James Stephen, On Desultory and Systematic Reading

2. figurativelynot comparableIrremediable, incorrigible.

   an incurable romantic

In a sentence

They were labouring under a profound, and, as it might have seemed, an almost incurable ignorance.

1854, James Stephen, On Desultory and Systematic Reading

Where it comes from

1. Late Latinincurabilis
2. Old Frenchincurable
3. Englishincurable

From Old French incurable, from Late Latin incurabilis.