demi-monde
/ˈdemɪmɔnd; `dɛmɪˌmɑnd/ n[Gp]
(French 法)
1 group of people whose actions are thought to be not entirely legal, respectable, etc 不正派的一群人
the demi-monde of gambling clubs and sleazy bars 赌场和低级酒吧里不正派的人.
2 (formerly) women thought to be not entirely respectable and for this reason not acceptable to society （旧时）因不正派而为社会嫌弃的女子.