in·de·fat·i·ga·ble
ˌin-di-ˈfa-ti-gə-bəl 
: incapable of being fatigued : untiring
an indefatigable worker
in·de·fat·i·ga·bil·i·ty
¦ində̇ˌfat|ə̇gə¦bilətē
-dēˌ-,
-at|,
|ēg-,
-ətē,
-i
plural -es
: the quality or state of being indefatigable
Examples of indefatigable in a Sentence
Adjective
a person of indefatigable patience
an indefatigable laborer who can work from sunrise to sunset
Recent Examples on the Web
Keith Phipps, Vulture, 15 June 2026
Even the indefatigable Thunder will face uncomfortable decisions this summer (and next) as its payroll spikes into the second apron.
—Bennett Durando, Denver Post, 7 June 2026
New York cooks up offense around the indefatigable Brunson and Towns’ newfound playmaking chops.
—Esfandiar Baraheni, New York Times, 3 June 2026
The Shark, so named early on for his intensity as basketball coach, dean and indefatigable fundraiser, stepped down from the Columbus presidency in 2018 but assumed his current, and final, role.
—Howard Cohen, Miami Herald, 1 June 2026
See All Example Sentences for indefatigable
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Adjective
And while Tom Loftis might not exactly be an indefatigable optimist like Parks and Rec’s Leslie Knope, he’s driven by a passion for civic improvement — and, of course, a desire to show up Eagleton Martha’s Vineyard.
—Keith Phipps, Vulture, 15 June 2026
Even the indefatigable Thunder will face uncomfortable decisions this summer (and next) as its payroll spikes into the second apron.
—Bennett Durando, Denver Post, 7 June 2026
New York cooks up offense around the indefatigable Brunson and Towns’ newfound playmaking chops.
—Esfandiar Baraheni, New York Times, 3 June 2026
The Shark, so named early on for his intensity as basketball coach, dean and indefatigable fundraiser, stepped down from the Columbus presidency in 2018 but assumed his current, and final, role.
—Howard Cohen, Miami Herald, 1 June 2026
See All Example Sentences for indefatigable
Cite this Entry
“Indefatigable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indefatigable. Accessed 22 Jun. 2026.
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indefatigable
adjective
in·de·fat·i·ga·ble
ˌin-di-ˈfat-i-gə-bəl
: capable of working a long time without tiring : tireless
an indefatigable teacher
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