Dizionario Polacco - Inglese

niezmordowany in inglese:

his unflagging energy

Unflagging energy She had shown unflagging support for us.

Once your animal has trespassed upon your territory, be unflagging in your outrage.

Harry, you need to slow down and work a little less. Nobody is indefatigable.

Marek is indefatigable in his trainings.

Marlene is quite indefatigable - I don't know she manages to fit everything in.

John is literally indefatigable, he always seems to have such reserves of energy that he never tires.

Annie was an indefatigable campaigner for better community services.