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

Then there are the countless bars and restaurants and shops that dot the strip. — Meka Boyle, Los Angeles Times, 3 Nov. 2026

His countless pop-ups around the city drew long lines of customers eager for a taste. — Tanasia Kenney, Charlotte Observer, 3 Nov. 2026

The people Trump is sacrificing for less than a day’s supply of diesel are my students, my colleagues and the countless other kind people who welcomed a clumsy foreigner to their country. — David Super, Baltimore Sun, 3 Nov. 2026

By 1960, the country had around forty million telephones, carrying countless American conversations through Ma Bell’s wires. — Cal Revely-Calder, New Yorker, 2 Nov. 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