IPA: /əˈdʌltli/
KK: /əˈdʌltli/
In a way that is mature and responsible, showing qualities typically associated with adults rather than children.
She handled the situation adultly, showing maturity beyond her years.
Adultly → It is formed from "adult" (from Latin "adultus", meaning grown up or mature) and "-ly" (a suffix meaning in a manner of). The word "adultly" means in a manner characteristic of an adult or mature person.
Think of the word 'adult' which means grown up, and remember that 'adultly' describes behaving in a grown-up manner.