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

What sets the game apart is its AI engine, which spawns countless non-player characters (NPCs) with unique storylines and characteristics. —Angelica Ang, Fortune, 3 Dec. 2025

This tool has removed countless spots from my beige couch, pet stains from rugs and carpet, food spills from dining room chairs, and that yellow color that starts to appear on mattresses over time. —Isabel Garcia, PEOPLE, 2 Dec. 2025

American democracy is straining under countless pressures, many of them rooted in structural problems that go back to the nation’s founding. —Andy Schultz, The Conversation, 2 Dec. 2025

Seeds of wisdom, compassion, love, joy, peace, patience, kindness, and more continue to bear fruit in the lives of countless individuals. —Laurie Richard, San Diego Union-Tribune, 2 Dec. 2025

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