- incapable of being tired out; not yielding to fatigue; untiring.
Origin of indefatigable
SynonymsSee more synonyms on Thesaurus.com
tireless, inexhaustible, persevering.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for indefatigability
No painter ever copied himself with more constancy and indefatigability.Greuze</p>
Alys Eyre Macklin
It is because of my own indefatigability in talking about talk about talk that they made me a Knight.The Tower of Oblivion
Your mastery of the language, and your indefatigability, would make you infinitely useful in any of these departments.
Owing to the indefatigability of collectors and their persistent and tempting offers, many have left their old homes.Chats on Cottage and Farmhouse Furniture
At the Westminster election, his indefatigability against the ministerial favourite came amply into play.
- unable to be tired out; unflagging
C16: from Latin indēfatīgābilis, from in- 1 + dēfatīgāre, from fatīgāre to tire
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
Word Origin and History for indefatigability
Online Etymology Dictionary, © 2010 Douglas Harper