Noun undoer has 3 senses
  1. undoer - a seducer who ruins a woman; "she awoke in the arms of her cruel undoer"
    --1 is a kind of
    seducer, ladies' man, lady killer
    Derived form: verb undo3
  2. undoer, opener, unfastener, untier - a person who unfastens or unwraps or opens; "children are talented undoers of their shoelaces"
    --2 is a kind of person, individual, someone, somebody, mortal, human, soul
    Derived forms: verb undo5, verb undo4
  3. destroyer, ruiner, undoer, waster, uprooter - a person who destroys or ruins or lays waste to; "a destroyer of the environment"; "jealousy was his undoer"; "uprooters of gravestones"
    --3 is a kind of bad person
    --3 has particulars:
     annihilator; iconoclast, image breaker; saboteur, wrecker, diversionist; vandal
    Derived form: verb undo3