IPA: /ˈpɑːrləs/
KK: /ˈpɑːrləs/
In a way that is full of danger or risk; perilously.
The hikers found themselves in a parlous situation when the storm hit unexpectedly.
Parlously is derived from the word "parlous" (meaning dangerous or perilous), which itself comes from the Middle English "perilous" (meaning full of peril), influenced by the Old French "perilleux" (meaning perilous). The suffix "-ly" (meaning in a manner) is added to form an adverb. Thus, "parlously" means in a manner that is full of danger or peril.
Think of 'parlous' meaning full of danger, and remember that 'parlously' describes doing something in a dangerous way.