tireless

[ tahyuhr-lis ]
See synonyms for: tirelesstirelesslytirelessness on Thesaurus.com

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

Origin of tireless

1
First recorded in 1585–95; tire1 + -less

Other words for tireless

Other words from tireless

  • tire·less·ly, adverb
  • tire·less·ness, noun

Words Nearby tireless

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use tireless in a sentence

British Dictionary definitions for tireless

tireless

/ (ˈtaɪəlɪs) /


adjective
  1. unable to be tired; indefatigable

Derived forms of tireless

  • tirelessly, adverb
  • tirelessness, 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