tireless

[tahyuhr-lis] / ˈtaɪər lɪs /

ADJECTIVE

determined

Synonyms

STRONGEST

energetic enthusiastic indefatigable resolute steadfast strenuous unflagging vigorous

WEAK

active ball of fire eager grind hard-working hyper incessant industrious jumping on the go perky persevering untiring unwearied unwearying

Antonyms

STRONGEST

apathetic enervated idle inactive lethargic tired unenthusiastic weak weary

WEAK

beat worn-out

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That’s certainly what led Caligiuri to become an ambassador and tireless advocate for the UPSL.

From Los Angeles Times • Jun. 7, 2026

"We honor their dedication and tireless efforts to confront one of the greatest challenges of our time," Johnson said.

From Barron's • Apr. 20, 2026

Impressed by the tireless activists he met online, he tried to emulate them, evangelizing and writing articles on Substack.

From The Wall Street Journal • Apr. 16, 2026

"I wish to highlight especially the role of women, who, though often victims of injustice, are tireless builders of peace. Their voice must be fully recognised in decision-making processes."

From BBC • Apr. 16, 2026

Thanks largely to the tireless work of his son, Powers was awarded the Silver Star by the Air Force in 2012.

From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin

Vocabulary lists containing tireless

"A Noiseless Patient Spider" by Walt Whitman

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Because of Mr. Terupt

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Pre-AP Theatre

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