1. A disposition free from stress or emotion
   - repose, quiet, placidity, tranquillity, tranquility 
2. The absence of mental stress or anxiety
   - peace, peacefulness, peace of mind, repose, heartsease, ataraxis

Derived forms: serenities

Type of: calm, calmness, composure, equanimity, quietness, quietude, tranquility, tranquillity, unflappability

Encyclopedia: Serenity

• lustring
• lustrous
• lustrously
• lustrum
• lusty
• lusus naturae
• Lut Desert
• Luta
• lutanist
• lute
• luteal
• luteal phase
• lutecium
• lutefisk
• lutein
• luteinizing hormone
• lutenist
• luteotropin
• luteous
• lutetium
• lutfisk
• Luther
• Luther Burbank
• Lutheran
• Lutheran Church