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

From a scenic walk along the Wisconsin River or nearby state parks, take in the views on one of the countless hiking trails around the Dells. —Usa Today Network, USA Today, 10 June 2026

He's seen countless fly balls hit off the bat. —Ian Miller Outkick, FOXNews.com, 9 June 2026

Those rings consist of countless billions of particles, the bulk of which are tiny, measuring from about the size of a grain of sand up to car-sized boulders, though the largest boulders are estimated to range anywhere from 30 to 60 feet (9 to 18 meters) across. —Joe Rao, Space.com, 9 June 2026

Since it was built, the villa has inspired countless artists and filmmakers, including director Giuseppe Tornatore, who featured it in a short film for a Dolce & Gabbana perfume commercial with Sophia Loren. —Ruchira Sharma, Condé Nast Traveler, 9 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