The term "most semioccasional" refers to something that happens occasionally, but not very often. Some antonyms for this phrase might include "frequent," "regular," or "routine." When something happens frequently, it occurs often, and may even happen on a regular schedule. Regular events are expected and anticipated, unlike something that happens occasionally or sporadically. Routine events are those that happen as part of a standard pattern, such as a daily or weekly routine. Using antonyms for "most semioccasional" can help to express the idea of something happening more frequently, regularly, or as part of a standard routine.