demi·monde /ˈdɛmɪˌmɑnd, mi-/
  行為放蕩的女人
  Dem·i·monde n.  Persons of doubtful reputation; esp., women who are kept as mistresses, though not public prostitutes; demireps.
  Literary demimonde, writers of the lowest kind.
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  demimonde
       n : a class of woman not considered respectable because of
           indiscreet or promiscuous behavior