What is another word for most backnumber?
Pronunciation: [mˈə͡ʊst bˈaknʌmbə] (IPA) 
The term "most backnumber" can be substituted by several synonyms such as outdated, obsolete, archaic, outmoded, old-fashioned, and retrograde. These words all refer to something that has lost its relevance or popularity over time. The use of such terms is most common in fields such as fashion, technology, and culture. For instance, a piece of vintage clothing may be considered old-fashioned or retrograde, while an old model of a phone may be deemed obsolete or outdated. Thus, choosing the right synonym largely depends on the context in which it is used and the degree of obsoleteness being conveyed.
