indefatigable

What does "indefatigable" mean?
The word "indefatigable" describes someone who possesses tireless energy and an unshakable persistence. Imagine a person who works through the night without a single complaint, or a traveler who keeps walking for miles without showing a hint of exhaustion; that is the essence of being indefatigable. This term is typically used in formal or literary contexts to praise someone’s work ethic or dedication. While "tireless" is a common synonym, "indefatigable" carries a slightly more sophisticated tone, often suggesting a noble or heroic level of commitment to a cause or task.
"indefatigable" in conversation
Discussing a colleague
I don't know how Mark does it. He's been working on this project for 48 hours straight.
I don't know how Mark does it. He's been working on this project for 48 hours straight.
He truly is indefatigable. Most of us would have crashed hours ago.
He truly is indefatigable. Most of us would have crashed hours ago.
Used to express genuine admiration for someone's stamina.
After a long hike
Are you ready to turn back yet? My legs are killing me.
Are you ready to turn back yet? My legs are killing me.
Not at all! I'm just getting warmed up.
Not at all! I'm just getting warmed up.
You are absolutely indefatigable, Leo. We've been hiking for six hours!
You are absolutely indefatigable, Leo. We've been hiking for six hours!
Highlights the contrast between a tired person and one with endless energy.
"indefatigable" in a sentence
She is an indefatigable worker.
She is an indefatigable worker.
The indefatigable explorer continued his journey despite the harsh weather conditions.
The indefatigable explorer continued his journey despite the harsh weather conditions.
Her indefatigable spirit in the face of repeated failures inspired everyone around her to keep trying.
Her indefatigable spirit in the face of repeated failures inspired everyone around her to keep trying.