Umptillion is a derived term of umpty.
As a noun umptillion
is (slang|hyperbole) an unspecified large number (of).
As an adjective umpty is
being indefinite, unspecified.
umptillion
English
Noun
(
en noun)
(slang, hyperbole) An unspecified large number (of).
Synonyms
*See also .
umpty
English
Adjective
(-)
Being indefinite, unspecified
Derived terms
* umpteen
* umptillion