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]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "execrate":
   abhor, abominate, abuse, accurse, anathematize, ban, bark at,
   berate, betongue, blacken, blaspheme, blast, censure, condemn,
   confound, curse, curse and swear, cuss, damn, darn, denounce,
   detest, dysphemize, excommunicate, fulminate against, hate, hex,
   hold in abomination, imprecate, jaw, load with reproaches, loathe,
   objurgate, rag, rail at, rate, rave against, reprehend, reprobate,
   reprove, revile, scatologize, shudder at, swear, talk dirty,
   throw a whammy, thunder against, tongue-lash, utterly detest,
   vilify, vituperate, yell at, yelp at