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

A tireless advocate of preserving chimpanzees’ natural habitat, Goodall died on Wednesday morning in California of natural causes, the Jane Goodall Institute announced on its Instagram page.

Read more on Los Angeles Times

It said her discoveries "revolutionised science" and that she was "a tireless advocate for the protection and restoration of our natural world".

Read more on BBC

Sarr offers quality in attack and, while fellow forward Mateta can be hit and miss - more miss than hit here - the Frenchman is a tireless, constant menace.

Read more on BBC

"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.

Read more on 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.

Read more on BBC

Related Words

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