How many letters does the top answer for “the state of being incurable; incurability. boyle.” have?

The most common answer is incurableness (13 letters).

Crossword clue: the state of being incurable; incurability. boyle.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

incurableness 13 letters web-def

incapability of being cured or healed

state of being forlorn. boyle. 50% similar → forlornness