in·fe·lic·i·ty /-səti/
  不幸,不吉,不適當
  In·fe·lic·i·ty n.; pl. Infelicities
  1. The state or quality of being infelicitous; unhappiness; misery; wretchedness; misfortune; lack of suitableness or appropriateness.
     Whatever is the ignorance and infelicity of the present state, we were made wise and happy.   --Glanvill.
  2. That (as an act, word, expression, etc.) which is infelicitous; as, infelicities of speech.
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  infelicity
       n : inappropriate and unpleasing manner or style (especially
           manner or style of expression) [ant: felicity]