unstageable adjective2 •Impossible to perform on a stage.“And there are these Russian works such as ‘Boris’ that some have called unstageable because they seem so massive in scale.” — 2009 •(US) 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. formsmore unstageable · most unstageable