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

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