0 working very hard at something and not stopping -- niezmordowany
He was a tireless campaigner/worker for children's organizations.
I want to thank James for his tireless efforts on behalf of the company.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Możemy go ukończyć krok po kroku, niezależnie od tego, jak długa jest droga, i nie da się go ukończyć, niezależnie od tego, jak krótka jest droga, jeśli nawet nie zaznaczysz swojego śladu.