[ uhmp-teenth ]
/ ˈʌmpˈtinθ /

adjective Informal.

of an indefinitely large number in succession: He was the umpteenth person to arrive.

Words nearby umpteenth

Also um·teenth [uhm-teenth] /ˈʌmˈtinθ/.

Origin of umpteenth

First recorded in 1915–20; umpteen + -th2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for umpteenth