The word "erraticalness" is spelled with three syllables: /e-rat-i-cal-ness/. The first syllable, /e/, is pronounced like the "e" in "bet". The second syllable, /rat/, has a short "a" sound, like "rat". The third syllable, /i-cal-ness/, is pronounced with the stress on the "i" and has the same sound as in the word "miracle". "Erraticalness" means the state or quality of being erratic, or inconsistent. It is not a commonly used word in English.