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Synonyms

countless

American  
[kount-lis] / ˈkaʊnt lɪs /

adjective

  1. too numerous to count; innumerable.

    the countless stars.
    Synonyms:
    unlimited, myriad, endless, numberless
countless British  
/ ˈkaʊntlɪs /

adjective

  1. innumerable; myriad

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • countlessly adverb

Etymology

Origin of countless

First recorded in 1580–90; count 1 + -less

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

After an hour on a freeway passing through suburban towns of countless rows of identical worker housing, we turned onto a more rustic road, headed into the country’s mountainous region.

From Slate • Mar. 30, 2026

The squeeze on supply has pushed oil and natural gas prices higher, with drastic knock-on effects for supply chains in countless industries.

From Barron's • Mar. 30, 2026

"The assertion that some crimes against humanity are less severe than others objectively diminishes the suffering of countless victims and survivors of other atrocities throughout history," he argued.

From BBC • Mar. 27, 2026

“I’m being more vocal, yes, because I’m gonna have to do that in college,” said Smith, who spent countless hours refining her mid-range jumper this winter.

From Los Angeles Times • Mar. 22, 2026

He wouldn’t think to tell me of Willa’s visit, but understands that I’ve spent countless hours revisiting that final hug?

From "The Bletchley Riddle" by Ruta Sepetys and Steve Sheinkin

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.