The term "on dot" refers to an action that occurs exactly at a specified time. Its antonyms include "late," "delayed," "behind schedule," "off-schedule," and "untimely." If something is "late," it means that it did not happen at the designated time or was delayed. Similarly, "delayed" means that the action was postponed, while "behind schedule" implies that the task is taking longer than expected. "Off-schedule" suggests a deviation from the original plan, and "untimely" means that the activity occurred at an inopportune moment. Therefore, while "on dot" denotes punctuality and precision, its antonyms indicate a lack of timeliness and promptness.