English Reference

Word

tirelessly

Phoneticstire·less·ly

US/ˈtaɪɹɫəsɫi/

UK/tˈaɪələsli/

Definition

adv. working very hard for a long time without stopping or getting tired.

adv. with great effort and persistence; in a manner that shows no signs of fatigue or loss of energy.

Examples

“She worked tirelessly to finish the report on time.”

“The rescue teams worked tirelessly through the night to find survivors in the wreckage.”

“The legal team advocated tirelessly for the defendant's rights, eventually uncovering the evidence that led to a full exoneration after years of appeals.”

Examples

simple

“She worked tirelessly to finish the report on time.”

contextual

“The rescue teams worked tirelessly through the night to find survivors in the wreckage.”

complex

“The legal team advocated tirelessly for the defendant's rights, eventually uncovering the evidence that led to a full exoneration after years of appeals.”

Usage

Typically follows the verb it modifies or the direct object.

Pitfall

He is a tirelessly worker

He is a tireless worker

Learners often use the adverb form 'tirelessly' to modify a noun, but the adjective 'tireless' is required in that position.

Real-World Examples

“Landslides, however, did block access to some villages but the experienced rescue teams worked tirelessly through the day to free those trapped under the rubble.”
BBC News · 15 Aug 2026
“They added: "We want to thank Salvamont Mountain Rescue, who have worked tirelessly since November searching for George; despite very difficult and often dangerous conditions.”
BBC News · 15 Aug 2026

Etymology

From tireless + -ly.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry

Level
B2 · Upper Intermediate
Frequency
Occasional
Updated

Scan code

englishreference.com/q/tirelessly

English Reference