How many letters does the top answer for “marked by or causing boisterous merriment or convulsive laughter” have?

The most common answer is hilarious (9 letters).

Crossword clue: marked by or causing boisterous merriment or convulsive laughter

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

hilarious 9 letters wn-def

marked by or causing boisterous merriment or convulsive laughter

uproarious 10 letters wn-def

marked by or causing boisterous merriment or convulsive laughter