> I'll have a look through my Facts on File Dictionary of Classical, Biblical, and Literary Allusions

Please do, MG, you might find what I'm trying to think of.
I like tsuwm's options; a bête noire is a little fav. of mine (sic).
I was lying round reading last night and it occured to me there there is probably a classical literary character that fits this description perfectly. I'm no expert on Greek lit. but I'm sure there's a Euripidean play that deals with this. Perhaps there is a character who fits this context? What about Deianeira? ...she certainly causes disaster unwittingly, when her desire to protect her marriage leads to Herakles' death, and her suicide. I don't know all those plays well enough to round down too well. Maybe someone else can. You'd think that in all the tragedies that Euripides or Aeschylus, or one of those blokes wrote, that they would have to have dealt with this topic.