countless
adj. C1 Advanced Oxford US //ˈkaʊntɫəs// UK //kˈaʊntləs// count·less
adj. too many to count. You use this to describe a very large number of things, like stars in the sky or times you have tried something.
adj. too numerous to be counted; existing in a quantity that exceeds practical calculation. Often used for rhetorical emphasis to suggest an infinite or overwhelming amount.
I have told him the same thing countless times.
The museum houses countless artifacts from the ancient world that have never been displayed to the public.
Despite countless warnings from environmental scientists regarding the fragility of the ecosystem, industrial expansion continued unabated for several decades.
From count + -less.
Usage
Typically used before a plural noun to emphasize scale or frequency.