The term 'not authentic' can be described by three crossword solutions: ERSATZ (6 letters), FAKED (5 letters), and POSING (6 letters). ERSATZ is a German word meaning 'SUBSTITUTE' or 'IMITATION, ' and it is often used to describe something that is not genuine. FAKED is a verb meaning 'to make something appear genuine when it is not, ' and it is often used to describe something that is not real. POSING is an action verb meaning 'to present oneself in a certain way, ' and it is often used to describe someone who is pretending to be something they are not. All three of these words can be used to describe something that is not authentic.