IPA: /ˌsplɛnˈdɪfərəsli/
KK: /splɛnˈdɪfərəsli/
In a way that is magnificent or splendid; wonderfully.
The event was organized splendiferously, leaving everyone in awe.
Splendiferously → It is formed from "splendid" (from Latin *splendidus*, meaning shining or bright) and the suffix "-ously" (meaning in a manner of). The word "splendiferously" means in a manner that is splendid or magnificent.
Think of something that is 'shining' or 'bright' ('splendid') and how it is done 'in a manner' ('-ously'). This helps you remember that splendiferously means doing something in a magnificent way.