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Definitions

tireless

[tahyuhr-lis] / ˈtaɪər lɪs /
ADJECTIVE
determined
Synonyms
STRONGEST
energetic enthusiastic indefatigable resolute steadfast strenuous unflagging vigorous
WEAK
active ball of fire eager grind hard-working hyper incessant industrious jumping on the go perky persevering untiring unwearied unwearying
Antonyms
STRONGEST
apathetic enervated idle inactive lethargic tired unenthusiastic weak weary
WEAK
beat worn-out

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“In his new role as acting attorney general, Todd will continue to be a tireless advocate for sanity, law and order, and policies that keep Americans safe.”

From The Wall Street Journal • Apr. 4, 2026

One of his former handlers, Romane Cristescu, said Bear had been a "tireless ambassador for koalas for a decade".

From Barron's • Mar. 25, 2026

Their disappearance made national headlines and led to police appeals and tireless searches of the town and flat countryside of The Fens.

From BBC • Feb. 27, 2026

“And I remember that like it was yesterday. The man was just a tireless worker and his work ethic was unmatched as a coach. He was always prepared.”

From Los Angeles Times • Feb. 22, 2026

But she tried her best to follow Grandma’s tireless example.

From "Fablehaven" by Brandon Mull