IPA: /ˈfrɪv.ə.ləs.li/
KK: /ˈfrɪv.ə.ləs.li/
In a way that is not serious or sensible; often used to describe actions or behaviors that lack importance or value.
She spent her money frivolously on unnecessary items instead of saving for the future.
Frivolously → It is formed from "frivolus" (from Latin, meaning worthless or silly) and the suffix "-ly" (meaning in a manner of). The word "frivolously" means in a manner that is silly or lacking in seriousness.
Think of something that is 'worthless' ('frivolus') and done 'in a manner' ('-ly') that is not serious. This helps you remember that 'frivolously' describes actions that are silly or trivial.