IPA: /ˈdrɪz.əl.ɪŋ.li/
KK: /ˈdrɪzəlɪŋli/
In a manner that involves light rain or drizzle.
The weather was drizzlingly wet, making it a perfect day to stay indoors.
Drizzlingly is formed from "drizzle" (from Middle English *drisslen*, meaning to fall in drops) and the suffix "-ly" (meaning in a manner). The word describes the manner in which something falls lightly in drops, like rain.
Imagine rain that falls in small drops, or 'drizzles', and think of the '-ly' as describing how it happens. This helps you remember that 'drizzlingly' means in a manner that resembles light rain.