The word "most anticipating" implies a strong desire or excitement for something that is yet to happen. Some possible antonyms for this phrase could include "least excited," "uninterested," or "apathetic." These words suggest a lack of enthusiasm or interest in the future event. Other antonyms might include "dreading," "fearing," or "anxious," which connote negative feelings or anxiety about what lies ahead. Ultimately, the choice of antonym will depend on the context and the speaker's attitude toward the anticipated event. Whether one is eagerly looking forward to something or dreading its arrival, there is always an opposite to be found.