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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.

One would expect boundless enthusiasm on management’s part after a day like that, but CEO Christian Weedbrook is maintaining a “business as usual” approach as he focuses on the company’s long-term goals.

From Barron's • Mar. 30, 2026

“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

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

He was loved for his wicked humor, delivered with a Buster Keaton straight face, and boundless generosity.

From "Seabiscuit: An American Legend" by Laura Hillenbrand

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.