How many letters does the top answer for “capable of being impugned; that may be gainsaid.” have?

The most common answer is impugnable (10 letters).

Crossword clue: capable of being impugned; that may be gainsaid.

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

impugnable 10 letters web-def

subject to being discredited

capable of being omitted; that may be omitted. 50% similar → omissible