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indefatigable (adj) determined and tireless.
An indefatigable person is determined and is never tired of doing a thing. They never give up their struggle for what they seek to achieve. An indefatigable worker is never deterred by any obstacle from his cause. Even the fear of death cannot stop them working for a cause.
- Mahatma Gandhi was an indefatigable champion of peace and nonviolence. He was prepared to die for the cause of peace, but would not stop fighting for it.
- An indefatigable worker in the cause of service, Mother Theresa devoted her whole life to the service of the aged and diseased.