How many letters does the top answer for “the trait of deserving trust and confidence” have?

The most common answer is trustiness (10 letters).

Crossword clue: the trait of deserving trust and confidence

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

trustiness 10 letters wn-def

the trait of deserving trust and confidence

trustworthiness 15 letters wn-def

the trait of deserving trust and confidence

the trait of not deserving trust or confidence 80% similar → untrustworthiness