How many letters does the top answer for “the quality of not being capable -- physically or intellectually or legally” have?

The most common answer is incapability (12 letters).

Crossword clue: the quality of not being capable -- physically or intellectually or legally

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

incapability 12 letters wn-def

the quality of not being capable -- physically or intellectually or legally

incapableness 13 letters wn-def

the quality of not being capable -- physically or intellectually or legally