Vocabulary

Melancholy- a feeling of pensive sadness or depression, typically with no obvious cause.

"And the men with the cigarettes in their straight-lined mouths,the men with the eyes of puff adders, took up their load of machine and tube, their case of liquid melancholy and the slow dark sludge of nameless stuff, and strolled out the door."

• Page 13 in Fahrenheit 451