circean

from The Century Dictionary.

• Pertaining to Circe, in Greek mythology a beautiful sorceress, who is represented by Homer as having converted the companions of Ulysses into swine by means of an enchanted beverage; hence, fascinating but brutifying; infatuating and depraving: as, a Circean draught.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having the characteristics of Circe, daughter of Sol and Perseis, a mythological enchantress, who first charmed her victims and then changed them to the forms of beasts; pleasing, but noxious.