Indefatigable adj. Untiring; peristent; relentless.
Indefatigability n. the capability of persistent effort; unrelenting; untiring
The word indefatigable comes from the Latin indefatigabilis, meaning "not able to be tired out." It describes a person, effort, or quality that is tirelessly persistent, showing an unflagging or unwearied determination. Someone who is indefatigable is able to keep going without tiring, no matter how long or strenuous the task. This term is often used to commend someone's relentless work ethic, stamina, or unwavering perseverance.
In literature and everyday language, indefatigable is often used to highlight a person’s ability to endure long periods of effort without loss of energy or enthusiasm. It implies a tireless spirit, whether in physical work, intellectual pursuit, or personal dedication, and conveys a sense of admirable persistence.
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"The optimism of a healthy mind
is indefatigable."
- Joel C. Rosenburg
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Positive Nouns that Describe People