indefatigable

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in·de·fat·i·ga·ble / ˌindəˈfatigəbəl/ • adj. (of a person or their efforts) persisting tirelessly: an indefatigable defender of human rights.DERIVATIVES: in·de·fat·i·ga·bil·i·ty / -ˌfatigəˈbilitē/ n.in·de·fat·i·ga·bly / -blē/ adv.

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