Which word is the closest synonym for *erratically*?

The word erratically describes actions or behavior characterized by a lack of consistency, unpredictability, or irregularity. Therefore, the closest synonym is irregularly, which mirrors the idea of not following a consistent or steady pattern. When something occurs irregularly, it happens in an unpredictable manner, similar to how erratic behavior unfolds.

In contrast, the other options present ideas of steadiness or predictability. Regularly and consistently imply a routine or a stable pattern, while predictably suggests that something can be anticipated or foreseen, which is contrary to the notion of being erratic. Overall, irregularly effectively captures the essence of erratic behavior, making it the most suitable choice.