How many letters does the top answer for “a texture of a surface or edge that is not smooth but is irregular and uneven” have?

The most common answer is roughness (9 letters).

Crossword clue: a texture of a surface or edge that is not smooth but is irregular and uneven

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

roughness 9 letters wn-def

a texture of a surface or edge that is not smooth but is irregular and uneven