unaccusably

The doing of these fifty years is unaccusably Right, as art; what its sentiment may be -- whether too great or too little, whether superficial or sincere -- is another question, but as artists 'work it admits no conception of anything better.

On the Old Road, Vol. 2 (of 2) A Collection of Miscellaneous Essays and Articles on Art and Literature John Ruskin 1859

But the slightest attempts to copy them will show you that the terminal lines are inimitably subtle, unaccusably true, and filled by gradations of shade so determined and measured that the addition of a grain of the lead or chalk as large as the filament of a moth's wing, would make an appreciable difference in them.

Lectures on Art Delivered before the University of Oxford in Hilary term, 1870 John Ruskin 1859