bad lot (?.)

• backslider
• bad egg
• black sheep
• blighter
• degenerate
• fallen angel
• good-for-nothing
• lecher
• lost sheep
• lost soul
• lowlife
• miscreant
• mucker
• no-good
• pervert
• pimp
• profligate
• recidivist
• recreant
• reprobate
• rounder
• scapegrace
• sorry lot
• trollop
• waster
• whore
• worm