Semioccasional is a term that refers to something that occurs infrequently or at irregular intervals. The antonyms for this word would be frequent, regular, or constant. These terms refer to something that occurs with great regularity, either at set intervals or repeatedly throughout a specific time period. Another antonym for semioccasional would be continuous, which refers to something that is uninterrupted and ongoing. Regularity and consistency play a vital role in making things more predictable, whereas semi-occasional events are less predictable and less convenient to schedule. Thus, the antonyms for semioccasional highlight the importance of regularity, consistency, and predictability in our day-to-day lives.