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

According to longtime manager Paul Rosenberg, the idea of an Eminem documentary has been pitched countless times throughout the years. —Hugh McIntyre, Forbes.com, 25 Aug. 2025

Old Navy Mid-Rise Wow Baggy Wide-Leg Jeans Take a walk on the wide-leg side, á la Naomi Watts, Joanna Gaines, and countless other stars, with these relaxed jeans from Old Navy. —Averi Baudler, People.com, 25 Aug. 2025

Over the years, Fowler has made multiple trips and devoted countless hours to Cairo — inspecting the site where the port will be rebuilt and modernized, encouraging Cairo’s preservation society and even hosting a block party. —John T. Shaw, Chicago Tribune, 25 Aug. 2025

The Milky Way sprawled above like a luminous brain—countless stars clustered in neural patterns, a cosmos of flickering connections. —Joshua Rothman, New Yorker, 25 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