The phrase "gotten started" typically means to begin or initiate a task or project. Its antonyms include words like ended, finished, completed, concluded, closed, terminated, and wrapped up. These words indicate that a particular task or project has come to an end. Some other antonyms for "gotten started" could also include procrastinated, delayed, stalled, or postponed, which signify a delay or lack of progress in initiating a task or project. Additionally, halt and stop could also be antonyms for the phrase, signifying an abrupt end to a task or project. Overall, there are numerous antonyms for "gotten started" that indicate a cessation or delay in initiating or completing a task or project.