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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.

But in most respects, he was Welty’s tireless enthusiast, even writing to the New Republic to defend her from a blistering review of her novel “Delta Wedding” in 1946.

From The Wall Street Journal

The tension comes from Odd Henderson, a schoolyard bully and tireless tormentor of Buddy, a character based on the young Capote.

From The Wall Street Journal

Ecke Jr. also had a reputation as a tireless promoter, further cementing the poinsettia-Christmas connection with magazine shoots and giving TV stations free poinsettias to decorate late-night talk shows or holiday specials.

From Los Angeles Times

The charity said since then he had been a "tireless advocate".

From BBC

A tireless robot—made possible through gains in battery life and the ability to self-charge—could mitigate such problems.

From The Wall Street Journal

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.