Indefatigable
/ˌɪndɪˈfætɪɡəbəl/
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Definition
(adj) Extremely persistent and untiring.
Sentence Examples
My grandfather is an indefatigable worker.
Mary is an indefatigable defender of the rights of indigenous communities.
CEFR Practice Quiz
The ____ social worker spent every single weekend helping the homeless people in the city.