per ‧ il ‧ ous ‧ ly /ˈperələsli, ˈperɪləsli/ BrE AmE adverb literary or formal
in a way that is dangerous and likely to result in something bad soon SYN dangerously :
Karpov, the champion, came perilously close to losing.
per ‧ il ‧ ous ‧ ly /ˈperələsli, ˈperɪləsli/ BrE AmE adverb literary or formal
in a way that is dangerous and likely to result in something bad soon SYN dangerously :
Karpov, the champion, came perilously close to losing.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012