How many letters does the top answer for “in a caustic vitriolic manner” have?

The most common answer is caustically (11 letters).

Crossword clue: in a caustic vitriolic manner

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

caustically 11 letters wn-def

in a caustic vitriolic manner

vitriolically 13 letters wn-def

in a caustic vitriolic manner

in a caustic manner. 67% similar → caustically