unactable

adjective

un·​act·​able ˌən-ˈak-tə-bəl 

: not capable of or suitable for being performed or portrayed : not actable

Stanley Kubrick, the director, has said of Nicholson that he brings to a role the one unactable quality—great intelligence.

—Ron Rosenbaum

an unactable script/play

Word History

First Known Use

1810, in the meaning defined above