How many letters does the top answer for “lacking courage or vitality” have?

The most common answer is gutless (7 letters).

Crossword clue: lacking courage or vitality

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

gutless 7 letters wn-def

lacking courage or vitality

lacking energy or vitality 50% similar → debilitated, enervated

lacking in elasticity or vitality 50% similar → springless

the trait of lacking courage 50% similar → cowardice, cowardliness