parlous

Parlous is both a synonym and a derivative of "perilous"; it came to be as an alteration of "perilous" in Middle English. ("Perilous" is derived from the Anglo-French perilleus, which ultimately comes from the Latin word for "danger": "periculum.") Both words are documented in use from at least the 14th century, but by the 17th century "parlous" had slipped from common use and was considered more or less archaic. It experienced a resurgence in popularity in the 20th century (although some critics still regarded it as an archaic affectation), and today it appears in fairly common use, often modifying "state" or "times."