How many letters does the top answer for “the quality or state of not being defensible. walsh.” have?

The most common answer is indefensibility (15 letters).

Crossword clue: the quality or state of not being defensible. walsh.

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

indefensibility 15 letters web-def

The quality or state of not being defensible. Walsh.

the state of not being 50% similar → nonbeing

the state or quality of not being deficient. strype. 50% similar → indeficiency