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

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 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

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

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

Definition of indefatigable

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

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

Every active iPhone, iPad, or Mac sold generates continuous cash flow regardless of whether the owner upgrades their physical device that year.

— Morgan Chittum, CNBC, 25 Aug. 2026
Meta reported in July that Instagram has 2 billion daily active users — nearly a quarter of the Earth's population.

— John Ruwitch, NPR, 25 Aug. 2026

Definition of active

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

untired

untiring

untiringly

See all Nearby Words

Cite this Entry

Style

“Untiring.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/untiring. Accessed 1 Sep. 2026.

Copy Citation

Synonyms of untiring

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

conscientious

Popular in Grammar & Usage

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Why does English have so many silent letters?

7 Pairs of Commonly Confused Words

Popular in Wordplay

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

Even More Words That Sound Like Insults But Aren't

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Popular

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

Games & Quizzes