This is the 12004th most frequent Spanish word.
incurables
Incurables: Incurable or untreatable.
Here, 'incurables' is used as an adjective describing diseases that cannot be cured.
Algunas enfermedades se consideran incurables.
Some diseases are considered incurable.
In this sentence, 'incurables' metaphorically describes mistakes as being irreparable or unfixable.
Sus errores fueron considerados incurables por su jefe.
His mistakes were considered incurable by his boss.
Here, 'incurables' acts as a noun referring to individuals who have conditions that cannot be treated.