indefatigable

in·de·fat·i·ga·ble
UK: /ˌɪndɪfˈætɪɡəbə‍l/   US: /ˌɪndɪˈfætɪɡəbəɫ/
lýsingarorð
  • óþreytandi (indefatigable in his pursuit)

Samheiti: tireless, unflagging, unwearying