Most heretofore is a phrase that is similar to "previously" or "up until now." Synonyms for this phrase include "hitherto," "so far," "beforehand," "formerly," and "formerly." These words are commonly used to describe a situation that existed in the past but may have changed or evolved over time. They are also used to refer to a topic or subject that has already been discussed or talked about in the past. When writing or speaking, it is good to have a variety of synonyms at your disposal to keep your language fresh and interesting. Utilizing these different words can also help to make your writing or speech more engaging and accessible to a broader audience.