countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : myriad, many

countlessly adverb

Synonyms

• 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

Cameroon Death Lake Lake Nyos in Cameroon, Central Africa; deadly carbon dioxide gas suddenly burst forth in 1986, creating a toxic cloud that killed nearly 1,800 people, 3,000 cattle, and countless domestic and wild animals, birds, amphibians, reptiles, and insects. —Literary Hub, 22 Oct. 2025

These efforts may offer a preview of what countless neighborhoods will eventually face. —Ingfei Chen, New Yorker, 22 Oct. 2025

Through countless posthumous releases, collaborations, and tributes, Selena has become one of the most influential and well-known figures in Latin music history. —Cat Cardenas, Rolling Stone, 21 Oct. 2025

Appearing on the latest episode of Amy Poehler's Good Hang podcast, the TV veteran was asked if anyone stood out to her among the countless guests and recurring stars who have appeared on the crime procedural since its 1999 premiere. —Ryan Coleman, Entertainment Weekly, 21 Oct. 2025

Word History

First Known Use

1588, in the meaning defined above

Kids Definition

countless

adjective

count·​less ˈkau̇nt-ləs 

: too numerous to be counted : innumerable