IPA: /ɪkˈstrævəɡəntli/
KK: /ɪkˈstrævəɡəntli/
In a way that involves spending a lot of money or using resources in a very generous or excessive manner.
She decorated her house extravagantly for the holiday party.
Extravagantly → It is formed from "extra-" (meaning beyond) and "vagari" (meaning to wander). The word describes a manner of spending or living that goes beyond the usual limits, often in a lavish or excessive way.
Think of going 'beyond' ('extra-') the usual limits in how one 'wanders' ('vagari') in spending or living — that's why extravagantly means in an excessive manner.