The word "umpteenth" is an adjective that means the nth, or in other words, a very large number. It is used to describe something that has been done or experienced a great many times.
I'd call it a tragedy, but the only ones truly suffering will be the paying audience, forced to endure Allen's umpteenth variation on the false comfort provided by marriage. (dvdtalk.com)
Carolynne has spent umpteenth hours handcrafting these quotes over the last 1.5 years. (thethirstytourist.com)
Final Thoughts: With mediocre reviews and Liam Neeson's umpteenth Taken - like action movie, this movie might be better served as a rental. (cinemanerdz.com)