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

Each time a shutter fires, and each time a tire squeals, involves countless pieces working together to deliver a smooth outcome. — Catherina Gioino, Fortune, 21 Oct. 2026

The bullet shattered his femur and left countless bullet fragments that surgeons were unable to remove. — Isaac Chotiner, New Yorker, 19 Oct. 2026

The event was attended by Mitte’s countless family and friends, as well as many professional peers. — Jon Blistein, Rolling Stone, 19 Oct. 2026

The Brazilian model’s gorgeousness helped sell countless bras, her beauty not only meeting the highest of prevailing standards but arguably moving the goalpost in an even harder-to-reach direction. — Marci Robin, Allure, 18 Oct. 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