erratacy Share definition Flag The state of being erratic. Unpredictable, and not in a good way. Her life was characterized by erratacy, and great mood swings brought on by unforeseen and unpredictable events. He majored in erratacy. erratacy by constant comment October 16, 2022 0 0 Get merch Get the erratacy mug. Buy Now — $32.95 See more merch