What is a synonym for "perilously"?

Common synonyms include: dangerously, hazardously, precariously, treacherously.

Perilously

adv

adv ·4 syllables ·Rare ·Advanced level

Adverb

1
In a perilous manner.
"A rather interesting and notable convenience, however, is that of ice water bags, which are hung on to the outside of the coaches at certain stops. These can be reached by leaning out of the window rather perilously, to unhook them, and paper cups are stocked in the compartments."

Adverb

"Due to overfishing, some fish stocks are now at perilously low levels."

From Middle English perilously; equivalent to perilous + -ly.