Unwearying in a sentence as an adjective

Our machines, with breath of fire, with limbs of unwearying steel, with fruitfulness, wonderful inexhaustible, accomplish by themselves with docility their sacred labor. And nevertheless the genius of the great philosophers of capitalism remains dominated by the prejudice of the wage system, worst of slaveries.

Unwearying definitions

adjective

showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"

See also: indefatigable tireless unflagging