UNTIRING Synonyms: 72 Similar and Opposite Words

untiring

adjective

ˌən-ˈtī-riŋ

Definition of untiring

as in meticulous

showing no signs of weariness even after long hard effort the camel's reputation as an untiring beast of burden the detective's untiring investigation of the crime finally led to several arrests

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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 untiring 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, 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 The public eye in Pakistan today is an unforgiving, untiring beast that never sleeps. — chicagotribune.com, 4 Aug. 2017 Corrupt regimes long reviled by their populace are being brought down left and right, thanks to the brilliant and untiring efforts of democracy activists. — Bruce Sterling, WIRED, 16 Feb. 2011

Recent Examples of Synonyms for untiring

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

The indefatigable Hellboy and Sons of Anarchy star, now 76, has half a dozen films in production, and next year is aiming to play Ernest Hemingway in a new biopic set in Cuba and will co-star in the anticipated Sons of Anarchy spinoff Legends.

— Andreas Wiseman, Deadline, 14 Oct. 2026
Musicians Julien Baker and Lucy Dacus, Saturday Night Live’s Sarah Sherman, Oscar winner and indefatigable activist Susan Sarandon, and Einbinder all showed up to rebuke the speech, citing the UN’s own labeling of Israel’s war on Gaza a genocide.

— Ryan Coleman, Entertainment Weekly, 25 Sep. 2026

Definition of indefatigable

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

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

This theory, also known as active inference or the free energy principle, has become one of the most important frameworks in neuroscience for understanding how the brain works as a whole.

— Maia Szalavitz, Scientific American, 20 Oct. 2026
Residents have been bracing to see what El Niño has in store this winter after an active hurricane season that has dramatically reshaped many of Southern California’s most famous beaches, including in San Clemente and adjacent Capistrano Beach.

— Hannah Fry, Los Angeles Times, 20 Oct. 2026

Definition of active

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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“Untiring.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/untiring. Accessed 23 Oct. 2026.

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Synonyms of untiring

adjective

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