INDEFATIGABLE Synonyms: 72 Similar and Opposite Words

indefatigable

adjective

ˌin-di-ˈfa-ti-gə-bəl

Definition of indefatigable

as in meticulous

showing no signs of weariness even after long hard effort an indefatigable laborer who can work from sunrise to sunset

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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 indefatigable Doyle, who limped through a medical career before turning to a life of crime fiction at the age of twenty-seven, had studied under Bell in the late 1870s, marveling at the doctor’s careful reasoning and indefatigable intuition. — Dan Piepenbring, Harpers Magazine, 22 Sep. 2026 Horwitz, 81, is now the vice president for alumni relations, indefatigable in that role but no longer embedded daily with the current roster. — Tyler Kepner, New York Times, 10 Sep. 2026 Gloria Steinem, the indefatigable feminist and journalist whose activism revolutionized the personal and professional lives of women, has died. — Elizabeth Chuck, NBC news, 3 Sep. 2026 San Francisco Playhouse is currently presenting the musical, helmed by company artistic director Bill English (with Phaedra Tillery-Boughton credited as associate director) and starring Ella Ruth Francis as the indefatigable dreamer Tracy Turnblad. — Randy McMullen, Mercury News, 27 Aug. 2026 See All Example Sentences for indefatigable

Recent Examples of Synonyms for indefatigable

Adjective

What followed was a meticulous restoration focused on preserving the original structures and historical details, and eventually, the addition of a couple of new buildings in the same vernacular to accommodate larger suites.

— Arati Menon, Condé Nast Traveler, 24 Oct. 2026
That setup, thanks in large part to Pask’s meticulous set-dressing, gives Crystal and his director Scott Ellis a potent visual metaphor.

— Jackson McHenry, Vulture, 22 Oct. 2026

Definition of meticulous

Adjective

Its sculptural geometry seems born of chance, gently carved and polished over time by the slow, relentless action of wind and erosion.

— Sofia Celeste, Footwear News, 26 Oct. 2026
Despite relentless internal memos about layoffs and content cuts since the summer, the BBC has only announced £200M of its half-billion goal.

— Max Goldbart, Deadline, 24 Oct. 2026

Definition of relentless

Adjective

All speakers paid tribute to Jack Gross, owner of the new station, for his untiring efforts to bring San Diego its own television station.

— sandiegouniontribune.com, sandiegouniontribune.com, 17 May 2018
Still, Clark's adrenaline and untiring preparation propelled her to a second place finish in Oslo and a third place finish at the Burton US Open the following month.

— Nihal Kolur, SI.com, 30 Oct. 2017

Definition of untiring

Adjective

Even if every senator were ethical, conscientious and committed to the public good, the incentives would remain the same.

— Nicholas Jacobs, The Conversation, 19 Oct. 2026
And there is a bonus benefit — people who are concerned about the future tend to make more conscientious decisions about the present.

— John T. Shaw, Chicago Tribune, 14 Oct. 2026

Definition of conscientious

Adjective

In one inexhaustible untitled image from 1980, the couple sits in elegant dress at a candlelit table engrossed in each other’s company, while the young, shirtless son adjusts the channel on a television perched on the near side of the same table.

— Leah Ollman, Los Angeles Times, 25 Aug. 2026
In 1922, when the river’s waters ⁠seemed inexhaustible, the seven states created a water-sharing compact dictating how much Upper and Lower Basin states receive.

— Reuters, NBC news, 31 July 2026

Definition of inexhaustible

Adjective

Federal physical activity guidelines recommend that adults get at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous activity each week, along with muscle-strengthening exercise on at least two days.

— Melissa Rudy, FOXNews.com, 17 Oct. 2026
The society recommends 150 to 300 minutes of moderate exercise or 75 to 150 minutes of vigorous exercise each week, with 300 minutes being ideal.

— Samantha Agate, Kansas City Star, 14 Oct. 2026

Definition of vigorous

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in deep water

indefatigable

indefatigably

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“Indefatigable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/indefatigable. Accessed 28 Oct. 2026.

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Synonyms of indefatigable

adjective

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