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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 family said Hardy died on Friday night after suffering a heart attack, remembering him as "a man of family, of boundless creativity" and "so full of life right to the end".

From BBC Aug. 2, 2026

Like Harbaugh, McDaniel has the kind of boundless energy that almost has him looking like a player when the team is running drills.

From Los Angeles Times Jul. 29, 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

The American economy has also grown more quickly than Europe’s in recent decades, leaving an impression of boundless opportunity.

From "Class Matters" by The New York Times

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