pron, det (infml 口) too many to count; numerous 数不清的; 无数的
*Umpteen of them left. 他们许多人都走了.
* have umpteen reasons for being late 迟到有许多理由.
very many - used especially when you are annoyed there are so many
There seemed to be umpteen rules and regulations to learn.
She'd called the apartment umpteen times, but never got an answer.