countless
Americanadjective
adjective
Other Word Forms
Etymology
Origin of countless
Explanation
Countless means more than you could possibly count. If you have countless reasons why you love living in New York, there are so many reasons that you can't list them all. Countless is a good adjective to use when you want to emphasize how endless, huge, or immeasurable something is. Your could say that smoke detectors save countless lives each year, or that your principal has tried countless times to ban soda at school, only to be outvoted by the student council over and over. The word dates from the 16th century, from the verb count, with its Old French root, conter, "add up."
Vocabulary lists containing countless
Much Ado: Synonyms for "Many"
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Talk Like Shakespeare Day, List 6
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"Dogs at Work"
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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.
Rather than a single solid shell, scientists now envision a Dyson "swarm" made up of countless orbiting structures that capture nearly all of a star's energy.
From Science Daily ● Jul. 10, 2026
L.A.’s love of fireworks makes for a colorful Fourth of July, with dozens of official celebrations and countless illicit explosions expected for the holiday.
From Los Angeles Times ● Jul. 4, 2026
His image is everywhere, from murals across the city to flags, shop windows and countless pieces of memorabilia.
From BBC ● Jul. 4, 2026
"It's been exhausting, crazy," Roa says about the countless hours they've worked both to find survivors and to recover bodies and return them to their families.
From Barron's ● Jul. 4, 2026
I have kicked up dust, left countless tracks across wide swathes of open waves of sand that glow in the daylight from the sun and turn dark black at night.
From "A Rover's Story" by Jasmine Warga
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.
