Incapable or seemingly incapable of being fatigued; tireless. See Synonyms at tireless.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "indefatigable" in a sentence
"Armstrong had long been known as an indefatigable spear-carrier for Harry Chandler, but at this moment he seemed unaware that the wind had shifted at Times headquarters."
"I thought that, according to George Galloway, only certain Middle Eastern dictators could be termed indefatigable?"
"Larsen: If you're ADD and you still have a kind of indefatigable creative drive ..."