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

• cringing
• cringle
• crinion
• crinite
• crinkle
• crinkled
• crinkleroot
• crinkly
• crinoid
• Crinoidea
• crinoline
• criollo
• cripes
• cripple
• crippled
• crippler
• crippling
• crisis
• crisis intervention
• crisp
• crispate
• crispen
• crisphead lettuce
• Crispin
• crispiness