Sustainable is the answer I'm pretty sure
Answer:
Ghostly.
Explanation:
Spectral means of or like a ghost.
The subject matter is in the poem's title. Their is a resentful mood although it's not plainly stated that the author resented her mother. Her mother's house represents the attitude of her mother; the walls stood at attention, the air knew to hold its breath, the polished floor defied heel marks... The personification is plain in these opening observations and, given the subject matter, it seems plain that these are reflections of the author's mother. It would seem that her mother is very commanding, superior, serious. Two lines I think are very telling:
"crinkled in discomfort in my mother's house"
It's not been named a childhood home, rather she's in (imagine italics) Her Mother's House
