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

Tens of thousands remain missing and countless others have lost homes, livelihoods and loved ones. — James Longman, ABC News, 3 July 2026

The script is different than the ones used in the countless school, community theater and other productions of the musical. — Tribune News Service, San Diego Union-Tribune, 3 July 2026

With key decisions still ahead, the Nashville Zoo and its supporters continue their efforts to help the clouded leopard — and countless other species — thrive. — Julianna Bragg, CNN Money, 5 July 2026

The country’s multicultural nature means people rarely have to go far to find an enlivening spot to watch Italy, Croatia, Mexico and countless other national teams. — Shelby Blackley, New York Times, 4 July 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