pentalogy /pen-talˈə-ji/

1. A pentad, esp of published works
2. A series of five related books

• unexplained
• unexploded
• unexploited
• unexplored
• unexposed
• unexpressed
• unexpressible
• unexpressive
• unexpugnable
• unexpurgated
• unextended
• unextenuated
• unextinct
• unextinguishable
• unextinguishably
• unextinguished
• unextreme
• uneyed
• unfabled
• unfact
• unfacts
• unfadable
• unfaded
• unfading
• unfadingly