Wiktionary
a. overproof; containing more alcohol than proof spirit.
Usage examples of "above proof".
You, my dear Colney, have offended his police or excise, who stand by the funnel, in touch with his palate, to make sure that nothing above proof is poured in.
That man, one of those honest souls that are above proof, a soldier respected by the bullets in spite of his valor, received his death-blow--there, in that armchair--and dealt by my hand, in a letter!
Unfortunately for the demon, a joke in which he indulged on this occasion detracted from the effect of the above proof of cleverness.
For the power to prove implies a sense of the need of proof, and things which the majority of mankind find practically important are in ninety-nine cases out of a hundred above proof.
The liquor was above proof, and as Boone returned and took up his position nearer the entrance, with his rifle, it threw up a vivid flame, which soon ignited the wax and the pitch-pine itself.
Accordingly the conversation, which began on the most friendly basis, soon warmed to an interest above proof, as the old man spoke of it next day to Richard Salton.