How many letters does the top answer for “quality of being active or spirited or alive and vigorous” have?

The most common answer is brio (4 letters).

Crossword clue: quality of being active or spirited or alive and vigorous

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

brio 4 letters wn-def

quality of being active or spirited or alive and vigorous

spiritedness 12 letters wn-def

quality of being active or spirited or alive and vigorous