1. In a quiet and tranquil manner
   "the sea now shimmered placidly before our eyes" 
2. In a placid and good-natured manner
   "I put the questions, and she answered them placidly"

See also: placid

• retrogradation
• retrograde
• retrograde amnesia
• retrogress
• retrogression
• retrogressive
• retromandibular vein
• retronym
• Retrophyllum
• retrorocket
• retrorse
• retrospect
• retrospection
• retrospective
• retrospectively
• retroussé
• retroversion
• retrovert
• Retrovir
• retrovirus
• retrovision
• retry
• retsina
• return
• return address