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

As countless children flock to summer camps around the country to enjoy the outdoors while school is out, the wholly American tradition has not existed without a history of tragic horror stories leaving families grieving the unimaginable. —Julia Bonavita, FOXNews.com, 8 July 2025

Even in a state that has seen countless politicians, both Republicans and Democrats, handed prison terms for corruption, Burke has been among the most influential. —Madeline Buckley, Chicago Tribune, 8 July 2025

Amazon Prime Day is in full swing, with sales on seemingly countless products waiting to be snatched up. —Madison Yauger, People.com, 7 July 2025

After countless hours working at 38,000 feet, Khaw has learned that ultra-long-haul flights reveal something fundamental about human nature, both in passengers and crew. —Iona Brannon, Travel + Leisure, 6 July 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