The Collaborative International Dictionary of English v.0.48:

Execrate \Ex"e*crate\, v. t. [imp. & p. p. Execrated; p. pr. &
   vb. n. Execrating.] [L. execratus, exsecratus, p. p. of
   execrare, exsecrare, to execrate; ex out + sacer holy,
   sacred. See Sacred.]
   To denounce evil against, or to imprecate evil upon; to
   curse; to protest against as unholy or detestable; hence, to
   detest utterly; to abhor; to abominate. "They . . . execrate
   their lct." --Cowper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

execrate
    v 1: find repugnant; "I loathe that man"; "She abhors cats"
         [syn: abhor, loathe, abominate, execrate]
    2: curse or declare to be evil or anathema or threaten with
       divine punishment [syn: accurse, execrate, anathemize,
       comminate, anathemise, anathematize, anathematise]