tireless

[ tahyuhr-lis ]

adjective

1. never seeming to tire; not slackening: his tireless efforts.

   a tireless worker;

   his tireless efforts.

   Synonyms: unfaltering, hardworking, industrious, unwearied

tireless

/ ˈtaɪəlɪs /

adjective

1. unable to be tired; indefatigable

Derived Forms

• ˈtirelessness, noun
• ˈtirelessly, adverb

Other Words From

• tire·less·ly adverb
• tire·less·ness noun

Word History and Origins

Origin of tireless¹

First recorded in 1585–95; tire ¹ + -less

Example Sentences

Similarly, much of the “cheapness” of oil and gas can be traced to subsidies and write-offs, borne out of tireless government lobbying, which distort the market in their favor.

From Outside Online

Supreme Court Justice Louis Brandeis was a tireless crusader for human rights who fought to regulate monopoly businesses and end the corrupt business practices of his time.

From Fortune

In a statement Friday, Alsobrooks thanked the work group and the community for their “tireless work” to produce a “thoughtful and thorough report.”

From Washington Post

Head coach Teri Moren cited Patberg’s “tireless, relentless passion” as one of many reasons she should excel in the WNBA.

From FiveThirtyEight

If you’ve seen the Freakonomics documentary, Sally is the tireless redhead running an education experiment in Chicago Heights in which we paid kids to do well in school.

From Freakonomics

For his tireless assault on evolutionary biology and downsizing the deity to fit within science, I give Meyer second place.

From The Daily Beast

“She was tireless and often seemed in a state of euphoria,” Pausini told police, according to the documents.

From The Daily Beast

His tireless courage inspired us to rise above the devastation.

From The Daily Beast

Your tireless and heroic sacrifices have made it possible for me to be here today.

From The Daily Beast

The gun advocates are tireless and they bet on suburban swing voters forgetting about their anger.

From The Daily Beast

Black Hood was clear of the building now, his legs working like tireless pistons.

From Project Gutenberg

He had a hard head, a splendid constitution, tireless industry, a generally judicious temper.

From Project Gutenberg

Never have I seen so unique a character as this voluble, hatched-faced, tireless woman.

From Project Gutenberg

One and all had sped forward,—at the doorway had met Godfrey and Musa, and their tireless blades.

From Project Gutenberg

Spinning—he was for ever spinning, like a tireless moth through a fiery air; and the world went roaring past.

From Project Gutenberg

Related Words

• energetic
• enthusiastic
• indefatigable
• resolute
• steadfast
• strenuous
• unflagging
• vigorous