Dictionary.com

tireless

[ tahyuhr-lis ]
/ ˈtaɪər lɪs /
Save This Word!
See synonyms for: tireless / tirelessly / tirelessness on Thesaurus.com

adjective
never seeming to tire; not slackening: a tireless worker;his tireless efforts.
QUIZ
CAN YOU ANSWER THESE COMMON GRAMMAR DEBATES?
There are grammar debates that never die; and the ones highlighted in the questions in this quiz are sure to rile everyone up once again. Do you know how to answer the questions that cause some of the greatest grammar debates?
Question 1 of 7
Which sentence is correct?

Origin of tireless

First recorded in 1585–95; tire1 + -less

OTHER WORDS FROM tireless

tire·less·ly, adverbtire·less·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use tireless in a sentence

British Dictionary definitions for tireless

tireless
/ (ˈtaɪəlɪs) /

adjective
unable to be tired; indefatigable

Derived forms of tireless

tirelessly, adverbtirelessness, noun
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
FEEDBACK