How many letters does the top answer for “not liable to failure” have?

The most common answer is foolproof (9 letters).

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Crossword clue: not liable to failure

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

foolproof 9 letters wn-def

proof against human misuse or error

Pattern

not liable to error 50% similar → inerrant, unerring

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