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Synonyms

boundless

American  
[bound-lis] / ˈbaʊnd lɪs /

adjective

  1. having no bounds; 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

Etymology

Origin of boundless

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

Explanation

Something that's boundless has no limits or restrictions. Your dog's boundless energy might leave you exhausted, since it never seems to end. The adjective boundless is often used to mean "huge" or "immense." Your local Christmas tree farm, for example, might seem boundless as you walk through the rows of evergreens that stretch as far as you can see. If your little brother has boundless enthusiasm for superheros, he's probably capable of talking about Batman for hours. The noun bound originally meant "limit," from the Old French word bonde, "limit or boundary," so boundless means "without limit."

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Vocabulary lists containing boundless

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.

See Examples For:

The voice, the songs, the smile, the wigs, the wit, the boundless energy, varied performances, unflagging generosity and palpable spirit of kindness.

From Los Angeles Times Aug. 26, 2026

MySpace and Tumblr, once spaces for boundless creativity, died the moment they sold out.

From Salon Jul. 15, 2026

This is an easy category error for anyone to make when talking about tourism, mistaking a country’s boundless beauty and hospitality toward visitors for anything else.

From Slate Jun. 25, 2026

On Wednesday, a group of pooh-bahs from college sports—an industry with boundless self-regard but limited ability to agree on anything—met with our elected pooh-bahs in Washington, D.C., who proudly do that for a living.

From The Wall Street Journal Jun. 4, 2026

After that, they fell quiet and gazed up into the boundless starlit expanse while the owls and crickets sang their night hymns all around them.

From "The Serpent King" by Jeff Zentner

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