se·ren·i·ty /səˈrɛnəti/
  寧靜,沈著,晴朗
  Se·ren·i·ty n.
  1. The quality or state of being serene; clearness and calmness; quietness; stillness; peace.
     A general peace and serenity newly succeeded a general trouble.   --Sir W. Temple.
  2. Calmness of mind; eveness of temper; undisturbed state; coolness; composure.
     I can not see how any men should ever transgress those moral rules with confidence and serenity.   --Locke.
  Note: ☞ Serenity is given as a title to the members of certain princely families in Europe; as, Your Serenity.
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  serenity
       n 1: a disposition free from stress or emotion [syn: repose, quiet,
             placidity, tranquillity, tranquility]
       2: the absence of mental stress or anxiety [syn: peace, peacefulness,
           peace of mind, repose, heartsease, ataraxis]