IPA: /ˈskɛrɪli/
KK: /ˈskɛrɪli/
In a way that causes fear or fright.
The movie was scarily realistic, making everyone jump at the sudden noises.
Scarily is formed from "scare" (from Old Norse "skera", meaning to frighten) and the suffix "-ly" (meaning in a manner of). The word "scarily" means in a manner that causes fright or fear.
Think of something that makes you feel frightened ('scare') and how it happens 'in a manner' ('-ly'). This helps you remember that 'scarily' describes something that causes fear.