unimpugnable

unimpugnable

(ˌʌnɪmˈpjuːnəbəl)
adj
formal not capable of being challenged or criticized
References in classic literature ?
Solely supported by his unimpugnable calculations, Mr Pancks led an unhappy and restless life; constantly carrying his figures about with him in his hat, and not only going over them himself on every possible occasion, but entreating every human being he could lay hold of to go over them with him, and observe what a clear case it was.
said on Twitter on Saturday: 'Its credibility is unimpugnable for being done and issued separately.'
Colonel Sartoris's accomplishment was that he "had robbed it for twelve years yet still contrived to die and be buried in the odor of unimpugnable rectitude" (233).
Clive has to be assimilated, his anarchic energies domesticated, channeled into the unimpugnable power of the State.