umpteenEnglishOxford Dictionary of Englishumpteen /ˌʌm(p)ˈtiːn , ˈʌm(p)tiːn / ▸ cardinal number informal indefinitely many; a lot of: you need umpteen pieces of identification to cash a cheque umpteen of them arrived at once. – DERIVATIVES umpty /ˈʌmpti/ adjective– ORIGIN early 20th century: humorous formation based on -teen.