Inconsistent is defined as something that is not staying the same throughout, not in agreement with itself or lacks uniformity. Antonyms for Inconsistent includes consistent, stable, constant, continuous, unvarying, dependable, predictable, unchanging, unwavering and persistent. Consistent, stable and constant all mean staying the same throughout. Continuous and unvarying indicate a lack of interruption or variety. Dependable and predictable suggest that an individual or thing can be relied upon to stay the same no matter what. Unchanging, unwavering, and persistent all refer to something that remains the same or continues for a long period without shifting.