tireless

adjective

ˈtī(-ə)r-ləs How to pronounce tireless (audio)
Definition of tirelessnext
as in meticulous
showing no signs of weariness even after long hard effort a tireless advocate for human rights

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 tireless 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 In 2023, Iranian activist Narges Mohammadi won the Nobel Peace Prize in recognition of her tireless campaigning for women’s rights and democracy, and against the death penalty. — ABC News, 21 Sep. 2026 She will also be remembered for her tireless work supporting mental health charities. — Max Goldbart, Deadline, 18 Sep. 2026 See All Example Sentences for tireless
Recent Examples of Synonyms for tireless
  1. meticulous
  2. indefatigable
  3. relentless
  4. unflagging
  5. conscientious
  6. untiring
  7. active
  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
  • 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
  • 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
  • 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
  • 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
  • Cornell has more than 20 active fraternities affiliated with its Interfraternity Council.
    — Leah Willingham, Los Angeles Times, 13 Oct. 2026
  • Bergen said the brand has always been very active in collaborations and cross-branding.
    — Lisa Lockwood, Footwear News, 13 Oct. 2026
Definition of active
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

tiredness
tireless
tirelessly
See all Nearby Words

Cite this Entry

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

Copy Citation
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Last Updated: - Updated example sentences

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of compunction

See Definitions and Examples »

Popular in Grammar & Usage

See More

'Affect' vs. 'Effect'

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

The Exceptions of '-s' and '-es' Plurals

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

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

Popular in Wordplay

See More

16 Food Words Recently Added to the Dictionary

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

Did 'orange' the fruit or the color come first?
See More

Popular

See More

'Affect' vs. 'Effect'

16 Food Words Recently Added to the Dictionary

The Real Origin of 'Supercalifragilistic'
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
artwork of illustrated limes with the text limes and smile with an arrow connecting the two words
Quiz: Spot the Anagram! Scramble these words to find new words with the e...
See All