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 In June 2022, the indefatigable band embarked on a 60th anniversary tour, which began in Madrid and wrapped in August in Berlin. — Stephanie Sengwe, PEOPLE, 27 July 2026 And then there’s the indestructible, indefatigable Rolling Stones. — Marc Ballon, Los Angeles Times, 10 July 2026 Walter would become my indispensable, indefatigable partner in every endeavor that followed. — Bill Frist, Forbes.com, 30 June 2026 The audience and the other participants go to great lengths each season to insure the safety of the few indefatigable girls who impress us with their authenticity and make full use of their latitude to become tragic heroines. — Lillian Fishman, New Yorker, 27 June 2026 See All Example Sentences for indefatigable

Recent Examples of Synonyms for indefatigable

Adjective

This discovery highlights the crucial need for meticulous AI persona creation to prevent skewed data.

— Lance Eliot, Forbes.com, 30 Aug. 2026
Plan Your Route Remote 4x4 travel in Iceland requires meticulous logistical planning.

— Gwen Nicol, Travel + Leisure, 29 Aug. 2026

Definition of meticulous

Adjective

The film seeks to celebrate Guillén’s life while honoring the tireless advocacy of her family, whose campaigning inspired lasting legislative change and amplified the voices of military families.

— Andreas Wiseman, Deadline, 19 Aug. 2026
Banks, the first saxophonist to receive the prestigious Avery Fisher Award, is a tireless advocate for his instrument in the classical world.

— Beth Wood, San Diego Union-Tribune, 16 Aug. 2026

Definition of tireless

Adjective

The gross margin outlook was a bit lower than expected, with Kress attributing the crunch to the relentless rise in memory prices, both for the remainder of this fiscal year and for fiscal 2028.

— Zev Fima, CNBC, 27 Aug. 2026
Fans, artists, and leaders across all industries are mourning the star whose relentless optimism, grace, and resilience was a shining light.

— Charisma Madarang, Rolling Stone, 26 Aug. 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

Less so is the fact that more vulnerabilities are being discovered by bounty hunters assisted by AI tools, leaving Google fighting a battle to patch them before less conscientious hackers find them and put them to criminal use.

— Davey Winder, Forbes.com, 21 Aug. 2026
The reptile dealers need to be more conscientious, and there needs to be more captive breeding.

— Katie Campione, Deadline, 21 Aug. 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

Puppies should not engage in vigorous tug-of-war games because too much tugging can create jaw or bite problems.

— BestReviews, Chicago Tribune, 25 Aug. 2026
Second, legislation should promote vigorous competition among teams and conferences, not preserve the exclusive club of the current Power Four membership.

— U.S. Sen. Richard Blumenthal, Hartford Courant, 24 Aug. 2026

Definition of vigorous

Browse Nearby Words

in deep water

indefatigable

indefatigably

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“Indefatigable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/indefatigable. Accessed 2 Sep. 2026.

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Synonyms of indefatigable

adjective

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