indefatigable
/ˌɪndɪˈfætɪɡəbəl/
adjective
- Never becoming tired or giving up; extremely persistent and energetic.
- The indefatigable worker kept going even after 12 hours on the job.
- She was an indefatigable advocate for animal rights, speaking at every event she could.
- His indefatigable spirit inspired the whole team to keep trying.
Synonyms