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

• meatball
• meathead
• meatiness
• meatless
• meatloaf
• meatman
• meatpacking
• meatus
• meaty
• Mebaral
• mebendazole
• mebibit
• mebibyte
• mecca
• Meccano
• Meccano set
• mechanic
• mechanic's lien
• mechanical
• mechanical advantage
• mechanical device
• mechanical drawing
• mechanical energy
• mechanical engineer
• mechanical engineering