Not folly in believing in him and his authority—on that he was unimpeachably sincere.
It is her ambition to lead, but to lead nobly and unimpeachably.
We strive to hope that, though almost as curious, it is not so unimpeachably appropriate as the one quoted above.
Yet Miss Quisanté laughed, as a man's relatives often will although the rest of the world is unimpeachably grave.
The authorities on which Mrs. Oliphant relies for her facts are unimpeachably good.
Very excitable, he despised and deceived most of the masters; among his friends he was unimpeachably loyal.