The term 'no longer in use' can be described by four crossword solutions: OBSOLETE (8 letters), OUTWORN (7 letters), passe (5 letters) and DEFUNCT (7 letters). OBSOLETE means no longer produced or used because it has been replaced by something newer or better. OUTWORN means no longer fashionable or relevant. Passe is a French word meaning out of date or no longer fashionable. DEFUNCT means no longer existing or functioning. All of these words describe something that is no longer in use.