How many letters does the top answer for “unwillingness to tell lies” have?

The most common answer is veracity (8 letters).

Crossword clue: unwillingness to tell lies

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

veracity 8 letters wn-def

unwillingness to tell lies

to lie; to tell lies. 67% similar → lige

of lie, to tell a falsehood. 50% similar → lying

someone who tells lies 50% similar → fabricator, fibber