How many letters does the top answer for “not capable of undergoing fission” have?

The most common answer is nonfissionable (14 letters).

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Crossword clue: not capable of undergoing fission

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

nonfissionable 14 letters wn-def

not capable of undergoing fission

Pattern

capable of undergoing nuclear fission 60% similar → fissionable

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