inexecutable

“The inexecutable is all I’m interested in.”

But it seems that the name of Liszt as composer for the piano has become associated inseparably with the words 'inexecutable,' and making 'colossal demands.'

Inexecutable, in-ek-se-kūt′a-bl, adj. incapable of being executed.—n.

If the most marvelous exploits of terpsichorean art, almost inexecutable by the human toes and the human legs of living dancers, are capable of reproduction by puppets skilfully manipulated by the puller of the wires and strings whereby the little figures are suspended, so also are the dexterous feats of the juggler.

The place into which Esther had been cast was a spacious vestibule, into which surged fresh arrivals without ceasing, despite the efforts of the footmen and of a man who fretted and fumed, and gave useless and inexecutable orders.