At halfway point can be seen as a term that defines the midpoint of an event, journey or project. Antonyms, on the other hand, suggest contrasting ideas, which are the opposite of the original word. In terms of antonyms for at halfway point, one could use phrases like "at the beginning," "at the end," or "at the start." These terms essentially describe the two points at either end of the journey or project, rather than the midpoint. Other antonyms could include "not yet started," "completed," "fully finished," "before the finish line," or "before the starting line." These antonyms indicate whether the project is beginning or ending, or how much progress has been made towards its completion.