countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : myriad, many

countlessly adverb

Synonyms

• innumerable
• innumerous
• myriad
• numberless
• uncountable
• uncounted
• unnumbered
• untold

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

If its long history on the Cup schedule from 1965 to 2004 didn’t do it alone — as a place where Richard Petty and Jeff Gordon and countless others clinched championships — the February 2001 race seals it so. —Alex Zietlow, Charlotte Observer, 13 Apr. 2025

Garrett Crochet was mentioned in trade speculation countless times throughout 2024. —Lamond Pope, Chicago Tribune, 12 Apr. 2025

President Trump’s tariff plan appears determined to turn back the clock, and nowhere does his plan defy common sense more than with those same spices that Marco Polo and countless others in the ancient world journeyed for years to bring to the world. —Hank Tucker, Forbes.com, 11 Apr. 2025

And in addition to the millions of people with furry friends to celebrate, countless A-list musicians also have dogs, cats and other animals to honor on the occasion. —Hannah Dailey, Billboard, 11 Apr. 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