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

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

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 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 And while Foy is appealing as the indefatigable mother, Garfield leans too heavily into manic cutesiness as the endlessly chirpy father who at times seems less grown-up than his children. — Frank Scheck, HollywoodReporter, 20 Aug. 2026 The vehicle’s pearlescent sheen alone is worthy of a moment in the sun, and gives the car a timelessness on par with that of its indefatigable owner. — Viju Mathew, Robb Report, 15 Aug. 2026 See All Example Sentences for indefatigable

Recent Examples of Synonyms for indefatigable

Adjective

The glitzy brand, which started with its Singapore flagship in 1887, is known for its meticulous opulence and highly personalized service.

— Condé Nast, Condé Nast Traveler, 1 Oct. 2026
Everett is meticulous and thorough, if eccentric, carefully considering all kinds of little details for his character.

— Kyle Maclachlan, HollywoodReporter, 29 Sep. 2026

Definition of meticulous

Adjective

But among their best qualities, Dick Riordan was arrogantly confident, Jim Hahn had a steady hand on the tiller, Antonio Villaraigosa was tireless and passionate, Eric Garcetti was a long-range thinker on earthquakes, water and energy.

— Steve Lopez, Los Angeles Times, 25 Sep. 2026
Beck was an art piece, a Happening, a mobile performance installation made by the tireless work of a small coterie of people, including Leigh.

— Josephine Reisman, Vulture, 24 Sep. 2026

Definition of tireless

Adjective

The size of these companies has been a seismic change, as has the market’s relentless concentration around tech.

— Allie Garfinkle, Fortune, 28 Sep. 2026
Russia kept up its relentless round-the-clock attacks on the Ukrainian capital, hitting an office block where four people were killed, Zelenskyy said.

— HANNA ARHIROVA, Arkansas Online, 26 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

The output of such organizations affects everyone, and a conscientious official may reasonably fear that exiting in a crisis will only accelerate it.

— Eyal Press, New Yorker, 28 Sep. 2026
Almost 7% of Tarrant County kindergarteners had a conscientious exemption to at least one vaccine in the 2025-26 school year, up from 3% five years ago, according to state data.

— Ciara McCarthy, Fort Worth Star-Telegram, 14 Sep. 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

The guidelines also recommend pairing the strength training with 150–300 minutes of moderate-intensity aerobic activity (or 75–150 minutes of vigorous activity) each week.

— Melissa Rudy, FOXNews.com, 29 Sep. 2026
Miss Neal is vibrant and lovely as the young widow, and Hugh Marlowe is vigorous as her ambitious suitor.

— THR Staff, HollywoodReporter, 28 Sep. 2026

Definition of vigorous

Browse Nearby Words

in deep water

indefatigable

indefatigably

See all Nearby Words

Articles Related to indefatigable

Cite this Entry

Style

“Indefatigable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/indefatigable. Accessed 4 Oct. 2026.

Copy Citation

Synonyms of indefatigable

adjective

Example Sentences

Browse Nearby Words

Challenging Words You Should Know

Top 12 Sophisticated Compliments

Advanced Vocabulary Quiz

Cite this Entry

More from Merriam-Webster

Word of the Day

adventitious

Popular in Grammar & Usage

Do You Need a New Language Peeve?

More Commonly Mispronounced Words

Merriam-Webster’s Great Big List of Words You Love to Hate

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?

Popular in Wordplay

7 Great Ways to Say 'Great'

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

The Words of the Week - Oct. 2

12 Lovely and Unusual Words for the Natural World

Popular

Do You Need a New Language Peeve?

7 Great Ways to Say 'Great'

The Longest Long Words List

Games & Quizzes