► 形容動詞不詳  [ふしょう]  [liter]    
meaning:  clear not  rank: 4☆ この
本は
作者不詳だ ⇨ It is not clear who is the author of this book  
(☛ Usually about personal details)☆ 
年齢不詳の
男性 ⇨ A man of unknown age  
(☛ Usually about personal details)More examples:- 年齢不詳の死体 ⇨ A corpse of an undetermined age