2009 July 22, Patrick Healy, “Lincoln Center Festival Makes Way for the Czar”, in New York Times:
“And there are these Russian works such as ‘Boris’ that some have called unstageable because they seem so massive in scale.”
(US,medicine) Of a wound or ulcer, covered with slough or eschar, so that it cannot be assigned to any of the stages described in the National Pressure Ulcer Staging System.