A detested person:
— He is an anathema to me.

synonym: bete noire.

Roget 908: malediction, malison^†, curse, imprecation, denunciation, execration, anathema, ban, proscription, excommunication, commination^†, thunders of the Vatican, fulmination, maranatha^†; aspersion, disparagement, vilification, vituperation.    abuse; foul language, bad language, strong language, unparliamentary language; billingsgate, sauce, evil speaking; cursing etc. v.; profane swearing, oath; foul invective, ribaldry, rude reproach, scurrility.    threat etc. 909; more bark than bite; invective etc. (disapprobation) 932.    ... show more

A formal ecclesiastical curse accompanied by excommunication.

Dutch: verwensing, vervloeking, ban, anathema, banvloek