The Collaborative International Dictionary of English v.0.48:

Agonize \Ag"o*nize\, v. i. [imp. & p. p. Agonized; p. pr. &
   vb. n. Agonizing.] [F. agoniser, LL. agonizare, fr. Gr. ?.
   See Agony.]
   1. To writhe with agony; to suffer violent anguish.
      [1913 Webster]

            To smart and agonize at every pore.   --Pope.
      [1913 Webster]

   2. To struggle; to wrestle; to strive desperately.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

agonized \agonized\ adj.
   1. expressing pain or agony. agonized screams
      [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

agonized
    adj 1: expressing pain or agony; "agonized screams" [syn:
           agonized, agonised]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "agonized":
   affected, afflicted, clawed, convulsed, crucified, devoured by,
   distressed, harrowed, hurt, hurting, imbued with, impressed,
   impressed with, in distress, in pain, lacerated, lancinated,
   martyred, martyrized, moved, obsessed, obsessed by, on the rack,
   pained, penetrated with, racked, ripped, savaged, seized with,
   stricken, suffering, tormented, torn, tortured, touched, twisted,
   under the harrow, wounded, wracked, wrung