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Webster 1913 Edition

Adj.

Incapable of cure; incurable.

With patience undergo
A

cureless

ill, since fate will have it so.

Dryden.

Adj.

That cannot be cured or healed; incurable; not admitting of a remedy; as a cureless disorder; a cureless ill.

cureless ‎(comparative more cureless, superlative most cureless)

Lacking a cure, incurable.
- 1590, Edmund Spenser, The Faerie Queene, III.x:
  Matter of doubt and dread suspitious, / That doth with curelesse care consume the hart [...].