The quality or state of being flecked; the degree to which something is marked with flecks or spots.
From 'flecky' (full of flecks) + '-ness,' a suffix that converts adjectives into abstract nouns representing qualities or states.
The suffix '-ness' is incredibly productive in English—you can add it to almost any adjective to create a noun about that quality, which is why English has thousands of abstract nouns compared to other languages.
Complete word intelligence in one call. Free tier — 50 lookups/day.