Meaning of the word indefatigable in English

What does indefatigable mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

indefatigable

US /ˌɪn.dɪˈfæt̬.ɪ.ɡə.bəl/
UK /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl/

Adjective

persisting tirelessly in an activity or effort

Example:
Her indefatigable spirit helped her overcome every obstacle.
The researcher was indefatigable in his pursuit of a cure.