Uncontemporaneous is a word that means not existing or happening in the same period of time. Synonyms for uncontemporaneous include anachronistic, old-fashioned, antiquated, outdated, obsolete, archaic, outmoded, out of date, and old school. These words all refer to something that is no longer current or relevant in today's time. Anachronistic refers to something that belongs to a different time period, while old-fashioned and antiquated imply outdatedness and a lack of modernity. Outdated, outmoded, and obsolete all suggest that something is no longer useful or relevant. Archaic and old school both refer to something that is old-fashioned and out of date.