用法:
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.

用法:
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.

• be interested in doing sth(be interested to do sth)
• be jealous for(be jealous of)
• be liable for(be liable to)
• be limited to do sth(be limited to doing sth)
• be lost on(be lost to)
• be made from(be made of)
• be mistaken about(be mistaken for)
• be not(not be)
• be notable as(be notable for)
• be nuts at(be nuts on)
• be of a mind(be of one mind, be of the same mind)
• be out for(be out to)
• be perfect for(be perfect in)
• be pleased about(be pleased with)
• be pleased at(be pleased with)
• be properly(properly be)
• be responsible for(be responsible to)
• be sick of(be sick with)
• be skilful at(be skilful in)
• be slow to do sth(be slow in doing sth)
• be supposed to(be not supposed to)
• be sure of doing sth(be sure to do sth)
• be surprised at(be surprised by)
• be susceptible of(be susceptible to)
• be tired of(be tired with)