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

Other Word Forms

• tirelessly adverb
• tirelessness noun

Word History and Origins

Origin of tireless¹

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

Example Sentences

"With his tireless commitment, experience, expertise and innovative thinking, he has been instrumental in establishing Red Bull Racing as one of the most successful and attractive teams in Formula 1," Mintzlaff said.

From BBC

Ekitike's contribution deserves a deeper look because he is a tireless nuisance to opposition defences, willing to do the dirty work as well as grab the goalscoring glory.

From BBC

Baci paid tribute to the "tireless team" that made the achievement possible and shared a video of her reacting to the news on social media.

From BBC

He wasn’t around to see his onetime tireless assistant coach restore the 49ers to glory — including falling five yards shy of a Super Bowl victory.

From Los Angeles Times

De Minaur, a tireless defensive player, wrestled the break back but Auger-Aliassime regained his advantage in the next game before closing out the set.

From BBC

Related Words

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