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

• ˈtirelessly, adverb
• ˈtirelessness, noun

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

The academy saluted Curtis or his tireless charitable work as a co-founder of Comic Relief, a producer of Red Nose Day and for his efforts to end world poverty through groups like Make Poverty History.

From Los Angeles Times

Republican House Speaker Mike Johnson said the conservative anchor was a "tireless advocate for America’s soldiers and veterans".

From BBC

“Likewise, election officials and staff must be able to work in safety. We will continue our tireless efforts to safeguard our nation’s elections.”

From Los Angeles Times

"His tireless work and activism touched the lives of so many, both locally and on a broader national and global scale."

From BBC

He also thanked those who had "given their time to such tireless research in this field", many of whom were "descendants of enslaved people".

From BBC

Related Words

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