The word "jiffier" is generally used to describe something quick or speedy. Synonyms for this word include "fast," "swift," "rapid," "hasty," "snappy," "expeditious," "prompt," "brisk," "nimble," and "efficient." Each of these words carries a slightly different connotation but can be used interchangeably depending on the context. For instance, "swift" might be used to describe a runner's pace while "efficient" might be used to describe a process or system. Overall, there are many synonyms for "jiffier" that allow for versatility in language and expression.