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Synonyms

boundless

American  
[bound-lis] / ˈbaʊnd lɪs /

adjective

  1. having no bounds; bound; infinite or vast; unlimited.

    His boundless energy amazed his friends.
    Synonyms:
    illimitable, inexhaustible, unbounded, endless, limitless
boundless British  
/ ˈbaʊndlɪs /

adjective

  1. unlimited; vast

    boundless energy
"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

  • boundlessly adverb
  • boundlessness noun

Etymology

Origin of boundless

First recorded in 1585–95; bound 3 + -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.

“His vision and energy surrounding this great event remained boundless for 50 years.”

From Los Angeles Times • Mar. 22, 2026

People now face such a vast menu of options due to technology that the choices in life seem boundless, but that abundance didn’t spark curiosity in Kelly.

From MarketWatch • Mar. 13, 2026

The reinstatement of Kim as general secretary brought boundless joy at “guard posts, workplaces and home windows,” the Rodong editorial read.

From The Wall Street Journal • Feb. 25, 2026

He had put together an enviable sponsorship portfolio of boundless resources, including the full financial might of the state of Saudi Arabia, through its national oil company.

From BBC • Feb. 24, 2026

So what they must do, they agreed, was go away to one of the big countries, either to England or France, where opportunities to make good would be boundless.

From "Boy: Tales of a Childhood" by Roald Dahl

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.