How many letters does the top answer for “an impolite manner that is vulgar and lacking tact or refinement” have?

The most common answer is crudity (7 letters).

Crossword clue: an impolite manner that is vulgar and lacking tact or refinement

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

crudity 7 letters wn-def

an impolite manner that is vulgar and lacking tact or refinement

gaucheness 10 letters wn-def

an impolite manner that is vulgar and lacking tact or refinement