IPA: /ɔˈθɛntɪkli/
KK: /ɔˈθɛntɪkli/
In a way that is genuine and true to oneself or to the original.
She expressed her feelings authentically, without trying to hide her emotions.
Authentically → It is formed from "authentic" (from Greek "authentikos", meaning genuine or real) and the suffix "-ly" (meaning in a manner of). The word "authentically" means in a manner that is genuine or true to its origins.
Think of something being 'genuine' ('authentic') and 'in a manner of' ('-ly') — that's how you remember that authentically means doing something in a true or genuine way.