How many letters does the top answer for “producing no effect; inoperative. south.” have?

The most common answer is unoperative (11 letters).

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Crossword clue: producing no effect; inoperative. south.

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

unoperative 11 letters web-def

Producing no effect; inoperative. [Obs.] South.

Pattern

producing no result or effect 50% similar → unavailing

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