"I have so worked upon my imagination as really to believe that about the whole mansion and domain there hung an atmosphere peculiar to themselves and their immediate vicinity--an atmosphere which had no affinity with the air of heaven, but which had reeked up from the decayed trees, and the gray walls, and the silent tarn---a pestilent and mystic vapor, dull, sluggish, faintly discernible, and leaden hued." "I have so worked upon my imagination as really to believe that about the whole mansion and domain there hung an atmosphere peculiar to themselves and their immediate vicinity--an atmosphere which had no affinity with the air of heaven, but which had reeked up from the decayed trees, and the gray walls, and the silent tarn---a pestilent and mystic vapor, dull, sluggish, faintly discernible, and leaden hued." Which vocabulary word below BEST describes the mood of the sentence above?