IPA: /ˈdʌbli/
KK: /ˈdʌbli/
In a way that is two times as much or to a double degree.
She was doubly excited about her birthday party this year.
Doubly → It is formed from "double" (from Old French *doble*, meaning twofold or twice) and the suffix "-ly" (meaning in a manner of). The word "doubly" means in a manner that is twofold or twice.
Think of something being done 'twice' ('double') — the '-ly' just means in that manner. This helps you remember that 'doubly' means to do something in a twofold way.