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tireless

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The definition of tireless is energized and enthusiastic, showing great energy or not easily fatigued.

(adjective)

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.

See tireless in Webster's New World College Dictionary

adjective

that does not become tired; untiring or unwavering
characteristic of a tireless person; continuing, persistent, etc.: one's tireless efforts

Related Forms:

tirelessly adverb
tirelessness noun

See tireless in American Heritage Dictionary 4

adjective

Not yielding to fatigue; untiring or indefatigable.

Related Forms:

tireˈless·ly adverb

tireˈless·ness noun

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