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

There have been countless books, movies and TV shows adapted from or inspired by Arthur Conan Doyle’s Sherlock Holmes stories. — Rick Porter, HollywoodReporter, 6 Oct. 2026

The Marine Cream predates today’s collagen skin care boom, while the Cleansing Balm has held its own through countless new launches, viral routines, and changing beauty trends. — Camila Quimper, Footwear News, 6 Oct. 2026

The Mississippi State grad, 61, has definitely done his share of watching, waiting and warning us about countless, serious weather events. — Madeleine Marr, Miami Herald, 6 Oct. 2026

Creative Co-Op Martini Table This style of tripod side tables is a staple across countless home tours—like this Pennsylvania Georgian Revival, and even Keke Palmer’s Los Angeles home. — Julia Harrison, Architectural Digest, 6 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