Here's what rhymes with improprieties.

Consider these alternatives

impropriety / variety illegalities / localities misdeeds / needs malfeasance / reasons transgressions / presence malpractices / practices allegations / relations misbehavior / behavior irregularity / therapy abuses / induces anticompetitive / repetitive indiscretions / presence scandal / sample illegality / personality misrepresentations / relations favoritism / given misappropriation / relation investigated / indicated violations / relations misuse / whose inquiries / enquiries revelations / relations fraud / thought