1. In a wasteful manner
   "the United States, up to the 1920s, used fuel lavishly, mainly because it was so cheap"
   - extravagantly 
2. In a rich and lavish manner
   "lavishly decorated"
   - richly, extravagantly

See also: lavish

• high hat
• High Holiday
• High Holy Day
• high horse
• high jinks
• high jinx
• high jump
• high jumper
• high mallow
• High Mass
• high noon
• high pitch
• high point
• high priest
• high profile
• high quality
• high relief
• High Renaissance
• high roller
• high sea
• high season
• High Sierra
• high sign
• high society
• high spirits