backslider, bad egg, bad lot, blemish, degenerate, fallen angel, foreign body, foreign intruder, impurity, intruder, lecher, lost sheep, lost soul, miscreant, misfit, monkey wrench, mote, oddball, pervert, pimp, profligate, recidivist, recreant, reprobate, scapegrace, sliver, sorry lot, speck, splinter, stone, trollop, weed, whore