“Brumous” is a literary adjective that was popular in the mid-19th century. “Brumous” comes from the French adjective “brumeux,” meaning “foggy.” That, in turn, comes from the Latin word “bruma,” which means “winter.” The English adjective is closely connected to the noun “brume,” meaning “mist or fog.” The first recorded use of the noun “brume” is from the late 17th century, which is about 120 years before the first recorded use of the adjective “brumous.”