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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.

“Round the decay/Of that colossal wreck, boundless and bare/The lone and level sands stretch far away.”

From Los Angeles Times • Jul. 8, 2026

Touring a young United States in 1831, Alexis de Tocqueville marveled at Americans’ boundless appetite for commerce, industry and wealth.

From The Wall Street Journal • Jul. 4, 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

He remained "a defining voice in art across his lifetime," it added, praising his "boundless curiosity, mastery of colour and embrace of new technologies".

From Barron's • Jun. 12, 2026

Searching for the Man who lives in him was perhaps what he really meant, because certainly no beast has essayed the boundless, infinitely inventive art of human hatred.

From "The God of Small Things" by Arundhati Roy

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