1. in a wasteful manner (Freq. 2) - the United States, up to the 1920s, used fuel lavishly, mainly because it was so cheap • Syn: extravagantly • Derived from adjective: lavish, extravagant (for: extravagantly) 2. in a rich and lavish manner - lavishly decorated • Syn: richly, extravagantly • Derived from adjective: rich (for: richly), lavish