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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

The Wales back three were prominent with Josh Adams and Rees-Zammit dangerous with ball in hand, while Mee demonstrated a tireless work ethic in arguably his finest game for Wales.

From BBC • Mar. 14, 2026

A two-time presidential candidate and tireless organizer, he helped register voters, broker political coalitions, and elevate racial and economic justice onto the national stage for more than five decades.

From Salon • Feb. 21, 2026

Thanks largely to the tireless work of his son, Powers was awarded the Silver Star by the Air Force in 2012.

From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin