tireless

adjective

tire·​less ˈtī(-ə)r-ləs 

: seemingly incapable of tiring : indefatigable

a tireless worker

tirelessly adverb

tirelessness noun

Synonyms of tireless

• meticulous
• indefatigable
• relentless
• unflagging
• conscientious
• untiring
• active
• vigorous
• diligent
• energetic
• inexhaustible
• intense

Examples of tireless in a Sentence

She has been a tireless advocate for reform.

a tireless advocate for human rights

Recent Examples on the Web

As well as his dazzling talent, supporters loved the tireless work rate and enthusiasm of their No 7. — James Pearce, New York Times, 22 July 2026

The author encourages everyone to become a tireless tinkerer, embracing humility, learning new skills, and following curiosity to thrive. — Lintao "lt" Lu, Forbes.com, 22 July 2026

Honoring first responders During a ceremony on July 4, acting Venezuelan President Delcy Rodriguez honored rescuers from 18 countries and their search dogs for their tireless efforts in helping the country recover. — Pat Mueller, USA Today, 7 July 2026

Instead, Alfonzo’s first appearance, the culmination of nine tireless years, was somber , stricken by the grief overshadowing what should’ve been a joyous moment in the Dodgers’ to the Padres. — Liana Handler follow, Los Angeles Times, 6 July 2026

Word History

First Known Use

1605, in the meaning defined above

Rhymes for tireless

• fireless

Kids Definition

tireless

adjective

tire·​less ˈtī(ə)r-ləs 

: seeming never to get tired

a tireless worker

tirelessly adverb