“Quondam” is an adjective meaning “former” that comes from the Latin for “formerly.” There are many ways to describe something from the past, including “past” itself, “late,” “previous,” “preceding,” “earlier,” “erstwhile,” “bygone,” “olden,” and “of yore,” but “quondam” is one of the more unusual synonyms. If you want to be even more unconventional, “umquhile” is a word that originates from Scottish English dialect, meaning “former” or “deceased.”