indefatigable

adjective

ˌin-di-ˈfa-ti-gə-bəl How to pronounce indefatigable (audio)
Definition of indefatigablenext
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

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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 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 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 See All Example Sentences for indefatigable
Recent Examples of Synonyms for indefatigable
  1. meticulous
  2. tireless
  3. relentless
  4. untiring
  5. unflagging
  6. conscientious
  7. inexhaustible
  8. vigorous
Adjective
  • Harris also helped shape the movie’s imagination sequences, pushing Pixar’s artists toward more spontaneous, painterly images rather than the studio’s usual meticulous realism.
    — Davide Abbatescianni, Variety, 16 Oct. 2026
  • While the restorations are only to the marble surface of the building, the meticulous nature of the job would have disrupted all aspects of the Plaza experience for would-be guests.
    — Timothy Latterner, Condé Nast Traveler, 16 Oct. 2026
Definition of meticulous
Adjective
  • Bartel, by far the most tireless promoter of the Beatles connection with southern Illinois, is himself 77.
    — Christopher Borrelli, Chicago Tribune, 18 Oct. 2026
  • But the tireless churn of his storytelling, picking up and depositing little clues of what came before, is the mark of an auteur who has barely scratched the surface of his prowess.
    — Matthew Ritchie, Pitchfork, 15 Oct. 2026
Definition of tireless
Adjective
  • The classic free-radical theory of aging, first proposed in the 1950s, held that aging itself resulted from the relentless buildup of ROS in our cells, decade after decade, and the wear and tear this caused.
    — Rowan Jacobsen, Scientific American, 20 Oct. 2026
  • Since 2017, Dulgarian has grown TAGABOW from its placid, solo origins into one of the decade’s most influential and inventive shoegaze bands; the proof is in Lotto, their bold and relentless breakout LP from last year.
    — Abby Jones, Pitchfork, 19 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
  • Tristan is the ultramarathon of opera roles, long and punishing, and not many tenors carry it off with such unflagging grace.
    — Justin Davidson, Vulture, 11 Mar. 2026
  • The new press release appears to tout that same unflagging punk ethos.
    — Connie Ogle, Miami Herald, 29 Aug. 2025
Definition of unflagging
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 legendary French fashion house was making a second issue of its surprisingly vigorous, thick-stock glossy art magazine.
    — Nate Freeman, Vanity Fair, 9 Oct. 2026
  • Brisk walking, light cycling, doubles tennis and household chores such as vacuuming, mopping and mowing the lawn were categorized as moderate activity; vigorous activity included jogging, fast cycling, singles tennis and aerobics.
    — Jennifer Fields, Washington Post, 8 Oct. 2026
Definition of vigorous

Browse Nearby Words

in deep water
indefatigable
indefatigably
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Cite this Entry

“Indefatigable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/indefatigable. Accessed 20 Oct. 2026.

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