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.

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

Their study, published in the Journal of Vertebrate Paleontology in July 2020, noted that the name honored "his tireless work on the Late Cretaceous paleontology of the Southeast and Eastern Seaboard, USA."

From Science Daily • Apr. 15, 2026

One of his former handlers, Romane Cristescu, said Bear had been a "tireless ambassador for koalas for a decade".

From Barron's • Mar. 25, 2026

Spurs will need him to do the same now as he showed here just how vital he could prove to be in tandem with the tireless Dominic Solanke.

From BBC • Mar. 15, 2026

Mother had gone back in the house, where we could hear her strange, tireless industry moving upon the empty rooms.

From "The Poisonwood Bible" by Barbara Kingsolver

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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