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tireless

American  
[tahyuhr-lis] / ˈtaɪər lɪs /

adjective

  1. never seeming to tire; not slackening: his tireless efforts.

    a tireless worker;

    his tireless efforts.

    Synonyms:
    unfaltering, hardworking, industrious, unwearied

tireless British  
/ ˈtaɪəlɪs /

adjective

  1. unable to be tired; indefatigable

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • tirelessly adverb
  • tirelessness noun

Etymology

Origin of tireless

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“Visibility is really important; continuing to get those eyes,” said Knight, a tireless promoter of the game.

From Los Angeles Times

The Dalai Lama lives in exile in India and is known for his tireless campaign for greater autonomy for his Tibetan homeland, which Beijing says is an integral part of China.

From Barron's

The charismatic 90-year-old, who lives in exile in India, is lauded worldwide for his tireless campaign for greater autonomy for his Tibetan homeland, which Beijing says is an integral part of China.

From Barron's

As he climbed in Hollywood as a director and producer, Ratner became just as well-known in these circles as a tireless operator, according to people who worked with him.

From The Wall Street Journal

At a meeting in Darlington last month, Streeting said he had been inspired by the families' "remarkable courage and tireless campaigning while they were suffering unimaginable grief".

From BBC