IPA: /ˈlævɪʃli/
KK: /ˈlævɪʃli/
In a way that is extravagant or luxurious, often involving a lot of money or resources.
They celebrated their anniversary lavishly, with a grand party and expensive gifts.
Lavishly → It is formed from "lavish" (from Middle English *lavissh*, meaning profuse or extravagant) and the suffix "-ly" (meaning in a manner of). The word "lavishly" means in a manner that is extravagant or abundant.
Think of someone acting in a very extravagant way — that's what 'lavishly' means, doing something in a profuse manner.