1. in a wasteful manner

- the United States, up to the 1920s, used fuel lavishly, mainly because it was so cheap

Similar word(s): extravagantly

2. in a rich and lavish manner

- lavishly decorated

Similar word(s): extravagantly, richly

Sentences with lavishly as an adverb:

- He was noted to entertain lavishly, throwing the biggest and best parties in town.