1. With no problems or difficulties
   "put the plans into effect quickly and smoothly"
   - swimmingly 
2. In a smooth and diplomatic manner
   "'And now,' he said smoothly, 'we will continue the conversation'"

See also: smooth

• lanceolate
• lanceolate leaf
• lanceolate spleenwort
• lancer
• lancers
• lancet
• lancet arch
• lancet window
• lancet-shaped
• lancetfish
• lancewood
• lancewood tree
• Lanchou
• Lanchow
• lancinate
• lancinating
• land
• land agent
• land area
• land cress
• land development
• land grant
• land mile
• land mine
• Land of Enchantment