Definition of "distinctness"

In New York a Bohemian criminal is such a rarity that the case of two firebugs of several years ago is remembered with damaging distinctness.

1890, Jacob A[ugust] Riis, “The Bohemians—Tenement-house Cigarmaking”, in How the Other Half Lives: Studies among the Tenements of New York, New York, N.Y.: Charles Scribner’s Sons, page 137