INDEFATIGABLY Synonyms: 13 Similar and Opposite Words

indefatigably

adverb

as in tirelessly

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of indefatigably Selling cigarettes on the street to buy food for her siblings, the pre-teen is indefatigably upbeat, eagerly anticipating an imminent passage to Germany. — Guy Lodge, Variety, 24 Jan. 2026 Matthew Restall, for example, has worked indefatigably as a myth buster for dozens of misconceptions for roughly two decades now, and only recently did another historian, Camilla Townsend, stitch together the history of the Aztecs according to their own statements, as recorded in Nahuatl. — Literary Hub, 18 Aug. 2025

Recent Examples of Synonyms for indefatigably

Adverb

The Dream Box itself is tribute to her original mentor and uncle, Bill Owens, who has worked tirelessly to preserve the American Chestnut tree.

— Isabelle Farina, Variety, 27 Aug. 2026
The very cloth masks that Fauci, Walensky, Murthy and Zients had worked tirelessly to promote to the American people.

— Ian Miller OutKick, FOXNews.com, 26 Aug. 2026

Definition of tirelessly

Adverb

Why aren’t cabinet officials or high-ranking military officers vigorously and publicly opposing them?

— Voice of the People, New York Daily News, 20 Aug. 2026
But the legality of their use has been vigorously debated as a possible violation of the laws of war, and they have never been deployed at scale.

— Simon Shuster, The Atlantic, 20 Aug. 2026

Definition of vigorously

Adverb

In what is often considered Pelechian’s magnum opus, the ancient antagonism of nature and humanity plays out in a depiction of a remote farming community, energetically scored with Armenian folk music and Vivaldi’s The Four Seasons.

— Jill Goldsmith, Deadline, 18 Aug. 2026
Plenty of his peers filled the void, none more energetically than Chesney, who has by now built a beachy brand that almost rivals Buffett’s.

— Kelefa Sanneh, New Yorker, 19 July 2026

Definition of energetically

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indefatigable

indefatigably

indefeasible

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“Indefatigably.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/indefatigably. Accessed 28 Aug. 2026.

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Synonyms of indefatigably

adverb

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