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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:

His vocabulary appears boundless, as does his apparent love for the city he grew up in, where he still lives.

From Los Angeles Times Jul. 20, 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

Like Steven Spielberg’s “The Fabelmans” before it, the film works best when viewed as a retrospective analysis of an entertainer’s life, and how easily cynicism can poison a child’s boundless imagination.

From Salon Jun. 2, 2026

"Joanne's love for her child was boundless, and the centre of her world. She was a devoted and loving mother," they said.

From BBC May 7, 2026

The lake seemed boundless, but I was not yet ready to give up.

From "Flying Through Water" by Mamle Wolo

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