Answer:
Inferno: A place or a state that resembles hell.
Ethereal: A place or state that resembles the heaven.
Explanation:
In simple words, Inferno means hell and Ethereal means heaven.
He is worried about Hamlet's well being it's kinda hard to enplane. (I read the book two years ago)
An Unfinished asymmetrical room is harder than a symmetrical room to complete as an informal room.