How many letters does the top answer for “not open to challenge” have?

The most common answer is unchallengeable (15 letters).

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Crossword clue: not open to challenge

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

unchallengeable 15 letters wn-def

not open to challenge

Pattern

not open to question 50% similar → unquestionable

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)