The antonyms for "carried to completion" can vary based on the context of the phrase. However, some possible antonyms include not finished, incomplete, unfinished, abandoned, halted, interrupted, or failed. These words indicate an incomplete or failed attempt at completing a task or project. They may also suggest a lack of commitment or effort towards achieving a particular goal. In contrast, "carried to completion" implies that a task or project has been successfully achieved, indicating dedication, perseverance, and hard work. Knowing the antonyms for "carried to completion" can help us identify areas of improvement and focus our efforts on achieving goals more effectively.