Words at Play : Top 10 Sophisticated Compliments
Definition:
able to work or continue for a very long time without becoming tired : tireless
Example:
"Yet through indefatigable large-heartedness and real talk with students, young teacher eventually makes astonishing progress with these overlooked kids in the face of an unsupportive bureaucracy." Joshua John Mackin, TheAtlantic.com, January 1, 2014
About the Word:
The grandeur of this word has long been recognized (and enhanced) by the British Royal Navy, which used the word indefatigable to name a class of battle cruisers in World War I.