The word "un systematically" can be replaced by numerous synonyms, depending on the context in which it is being used. Some possible alternatives include "haphazardly," "randomly," "chaotically," "irregularly," "sporadically," "inconsistently," "arbitrarily," "erratically," "unpredictably," and "incoherently." Each of these synonyms emphasizes a different aspect of an action or process that is not being conducted in a methodical or organized manner. By choosing the appropriate synonym for "un systematically," writers and speakers can add nuance and specificity to their language, helping to convey their intended meaning more effectively.