countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : myriad, many

countlessly adverb

Synonyms

• many
• numerous
• innumerable
• numberless

Examples of countless in a Sentence

There are countless reasons why that would not be a good idea.

I've been there countless times.

Recent Examples on the Web

Astronomers believe this record-breaking speed is the result of countless gravitational encounters during its interstellar voyage. —Jamie Carter, Forbes.com, 13 Aug. 2025

That’s just a bit of an issue amid the team’s seemingly countless (and ever-growing) list of on-field deficiencies. —Dieter Kurtenbach, Mercury News, 13 Aug. 2025

Leonardo DiCaprio has worked on countless modern classics with many of the biggest filmmakers of the past half-century. —Christian Zilko, IndieWire, 13 Aug. 2025

Kennedy Center 2024 honorees included Bonnie Raitt, Grateful Dead This year's class of honorees joins the ranks of countless other artists who claim the distinction. —Anna Kaufman, USA Today, 13 Aug. 2025

Word History

First Known Use

1588, in the meaning defined above

Kids Definition

countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : innumerable