How many letters does the top answer for “grave harmfulness or deadliness” have?

The most common answer is perniciousness (14 letters).

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Crossword clue: grave harmfulness or deadliness

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

perniciousness 14 letters wn-def

grave harmfulness or deadliness

toxicity 8 letters wn-def

grave harmfulness or deadliness

Pattern

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