Definition – 1: not harmonious :  discordant

2:  not fitting or congenial :  conflicting <inharmonious personalities>

Line – ” The furniture in this room is no worse than inharmonious, however, for we had to bring it all from downstairs”

Throughout the story we can clearly have a sense of how much she dislike this room that she is in. Having a understanding of what this word means helps me understand that in that line she is saying that simple the furniture doesn’t belong there it changes the whole vibe of the room. It gives a discomfort feeling to her.