Tireless

/ˈtaɪərləs/

Meaning & Definition

adjective
Without fatigue; unrelenting in effort or activity.
Her tireless dedication to the charity has improved many lives.
Showing continuous and persistent effort; not yielding to fatigue.
The tireless research of the scientists led to a breakthrough in cancer treatment.
Constantly active and energetic.
The tireless campaigner worked day and night to get her message across.
Marked by an unending commitment to a cause or activity.
His tireless pursuit of excellence inspired his colleagues.
Indefatigable; incapable of being tired out.
The volunteers were tireless in their efforts to help the victims of the disaster.

Etymology

From tire + -less, meaning without fatigue or weariness.

Common Phrases and Expressions

tireless effort
An ongoing effort that shows no signs of stopping.
tireless advocate
Someone who tirelessly supports a cause or belief.
tireless work ethic
A strong commitment to continuous work and effort.

Related Words

indefatigable
Persisting tirelessly.
unflagging
Not tiring or weakening.
relentless
Continuing without becoming weaker.

Slang Meanings

All-out effort
He's putting in all-out effort at his job, being totally tireless.
Go-getter
She’s such a go-getter, always tireless in her pursuits.