How many letters does the top answer for “having no qualities that would render it valuable or useful” have?

The most common answer is ineptitude (10 letters).

Crossword clue: having no qualities that would render it valuable or useful

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

ineptitude 10 letters wn-def

having no qualities that would render it valuable or useful

worthlessness 13 letters wn-def

having no qualities that would render it valuable or useful