How many letters does the top answer for “the quality of lacking a sharp edge or point” have?

The most common answer is obtuseness (10 letters).

Crossword clue: the quality of lacking a sharp edge or point

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

obtuseness 10 letters wn-def

the quality of lacking a sharp edge or point

the quality of having a sharp edge or point 67% similar → acuteness