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

Aging involves countless interacting processes operating across cells, tissues and organs. — Venki Ramakrishnan, Scientific American, 15 Sep. 2026

The two frequently performed together on tour, and June received co-billing on four of Johnny’s studio albums, with countless collaborations recorded throughout his extensive discography. — Brendan Le, PEOPLE, 12 Sep. 2026

And then there’s the real Hansen, who has been angling his way into the rollout with countless interviews and comments about the film. — Clayton Davis, Variety, 11 Sep. 2026

Overall, the tomb contained a total of 38 bodies and countless artifacts intended as offerings for the dead, who are believed to be Chimu elite. — Francesca Aton, ARTnews.com, 11 Sep. 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