countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : myriad, many

countlessly adverb

Synonyms of countless

• 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

The majority of fans on the Long Island, New York property appeared to be pulling against the Colorado native with countless shouts for his golf ball to find bunkers and minor roars after each of his five bogeys during the final round. —Mark Harris, FOXNews.com, 23 June 2026

Prime Day deals are here, and headphones are at the top of countless search bars as shoppers scour for the best deal. —Kelsey Legg, ABC News, 23 June 2026

In other words, someone or some entity would have to plow through the seemingly countless variables catalogued in the report and decide which would be included and which would be excluded. —Dan Walters, Mercury News, 23 June 2026

The same technological infrastructure that allows investors to own a portion of a racehorse, a luxury handbag portfolio, or a vacation property could eventually reshape countless other asset categories. —Robert Daugherty, Forbes.com, 23 June 2026

Word History

First Known Use

1593, in the meaning defined above

Kids Definition

countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : innumerable