Tireless Definition

tīrlĭs
adjective
Having or showing a capacity for persistent effort; not tiring or relenting.
American Heritage
That does not become tired; untiring or unwavering.
Webster's New World
Characteristic of a tireless person; continuing, persistent, etc.
One's tireless efforts.
Webster's New World
The definition of tireless is energized and enthusiastic, showing great energy or not easily fatigued.
If you are dedicated to helping the homeless and you spend countless hours continually fighting for their rights, this is an example of being a tireless advocate for the homeless.
YourDictionary

Without a tire (wheel covering); tyreless.

Wiktionary
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