"More semioccasional" can be replaced by synonyms like "sporadic," "intermittent," or "irregular." These words describe events or occurrences that happen infrequently or at irregular intervals, and convey the idea of something happening once in a while rather than regularly or frequently. Other synonyms include "occasional," "infrequent," and "scattered." The choice of synonym will depend on the context and the intended meaning. Whether it's used to describe events, behavior, or something else entirely, these words can convey a sense of unpredictability or rarity, making them useful for writers or speakers looking to add nuance to their language.