IPA: /ˈkjʊə.ləs/
KK: /ˈkjʊr.ləs/
Not able to be cured or healed; a condition that cannot be treated successfully.
The doctors said the disease was cureless, leaving the family devastated.
Cureless → It is formed from "cure" (from Latin "cura", meaning care or treatment) and "-less" (meaning without). The word "cureless" means without a cure or treatment.
Think of 'cure' as care or treatment, and remember that 'cureless' means lacking that care or treatment.