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 After Graham was eulogized Tuesday in the nation's capital as an indefatigable dealmaker by the president, vice president and others, mourners in Columbia prepared to remember him Wednesday as the son of pool hall owners who never forgot his roots. — ABC News, 29 July 2026 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 See All Example Sentences for indefatigable

Recent Examples of Synonyms for indefatigable

Adjective

Even so, Mitch said living with Justin is easy, thanks to his meticulous approach to nearly everything.

— Los Angeles Times, Los Angeles Times, 7 Sep. 2026
Instead, the project will be slow and meticulous to ensure no dust or debris falls onto the neighboring railroad tracks which border the mill on all sides.

— Jenna Ebbers, Kansas City Star, 3 Sep. 2026

Definition of meticulous

Adjective

During three seasons as the Rams’ offensive coordinator, Mike LaFleur said McVay established strong foundations but also used his tireless energy to encourage assistants to tear down tried-and-true concepts and build them back, sparking innovation.

— Los Angeles Times, Los Angeles Times, 8 Sep. 2026
But perhaps the most impressive thing the seemingly tireless Parton did during her 80 years was donate much of her wealth to impoverished communities.

— Donna Vickroy, Chicago Tribune, 28 Aug. 2026

Definition of tireless

Adjective

Luis Diaz’s relentless work off the ball laid the platform for Kane and Olise to enjoy their best individual seasons.

— Anantaajith Raghuraman, New York Times, 9 Sep. 2026
Among them is a simple farmer (a terrific Andrew Garfield) whose miserable, solitary life is illustrated by his relentless plowing of his fields and the three graves, marked by one large and two small crosses, that occupy his land.

— Frank Scheck, HollywoodReporter, 9 Sep. 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

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

Those kinds of vigorous debates have been going on from the moment the crowd spilled out of the Herzog into the Telluride night air.

— Matthew Carey, Deadline, 7 Sep. 2026
Each session was 60 minutes, with the actual exercise portion of the session done in about 20 minutes, with participants cycling hard and fast enough to get their heart rate into the moderate and vigorous zone.

— Michelle Marchante September 4, Miami Herald, 4 Sep. 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 14 Sep. 2026.

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Synonyms of indefatigable

adjective

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