nth(occurring at position n) adjective [UK: ˈenθ] [US: ˈenθ]
umpteenth(informal: occurring in a relatively large but unspecified position in a series) adjective [UK: ˈʌmp.tiːnθ] [US: ˈʌmp.ˌtinθ]I let myself be fooled by him for the umpteenth time. = Mi sono lasciata prendere in giro da lui per l'ennesima volta.
ennesimonoun {m}
nth(the item at position n) noun [UK: ˈenθ] [US: ˈenθ]