The Collaborative International Dictionary of English v.0.48:

Frenzy \Fren"zy\, v. t.
   To affect with frenzy; to drive to madness [R.] "Frenzying
   anguish." --Southey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Frenzy \Fren"zy\ (fr[e^]n"z[y^]), n.; pl. Frenzies
   (fr[e^]n"z[i^]z). [OE. frenesie, fransey, F. fr['e]n['e]sie,
   L. phrenesis, fr. Gr. fre`nhsis for freni^tis disease of the
   mind, phrenitis, fr. frhn mind. Cf. Frantic, Phrenitis.]
   Any violent agitation of the mind approaching to distraction;
   violent and temporary derangement of the mental faculties;
   madness; rage.
   [1913 Webster]

         All else is towering frenzy and distraction. --Addison.
   [1913 Webster]

         The poet's eye in a fine frenzy rolling. --Shak.

   Syn: Insanity; lunacy; madness; derangement; alienation;
        aberration; delirium. See Insanity.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Frenzy \Fren"zy\, a.
   Mad; frantic. [R.]
   [1913 Webster]

         They thought that some frenzy distemper had got into
         his head.                                --Bunyan.
   [1913 Webster]

WordNet (r) 3.0 (2006):

frenzy
    n 1: state of violent mental agitation [syn: craze,
         delirium, frenzy, fury, hysteria]

Moby Thesaurus II by Grady Ward, 1.0:

251 Moby Thesaurus words for "frenzy":
   Jacksonian epilepsy, Rolandic epilepsy, abandon,
   abdominal epilepsy, access, acquired epilepsy, activated epilepsy,
   affect epilepsy, agitation, akinetic epilepsy, amok, annoy,
   apoplexy, arouse, arrest, attack, autonomic epilepsy, awake,
   awaken, befuddlement, bewilderment, blockage, blow the coals,
   blow up, bluster, bother, botheration, bout, brawl, broil,
   brouhaha, cacophony, call forth, call up, cardiac epilepsy, chaos,
   clonic spasm, clonus, cloud, commotion, confusion, convulsion,
   cortical epilepsy, cramp, craze, cursive epilepsy, daze, delirium,
   dement, derange, discombobulation, discomfiture, discomposure,
   disconcertion, disorder, disorganization, disorientation, distract,
   distraction, disturbance, diurnal epilepsy, drive insane,
   drive mad, ebullition, eclampsia, ecstasy, embarrassment,
   embroilment, enkindle, enrage, epilepsia, epilepsia gravior,
   epilepsia major, epilepsia minor, epilepsia mitior,
   epilepsia nutans, epilepsia tarda, epilepsy, excite, excitement,
   falling sickness, fan, fan the fire, fan the flame, fanaticism,
   feed the fire, ferment, fever, fire, fire and fury, fit, flame,
   flap, flummox, flurry, fluster, flutter, focal epilepsy, fog,
   foment, fomentation, foofaraw, fuddle, fuddlement, fume, furor,
   furore, fury, fuss, grand mal, haute mal, haze, heat, hubbub,
   hysteria, hysterical epilepsy, ictus, impassion, incense, incite,
   infatuation, inflame, infuriate, intoxication, jumble, key up,
   kindle, larval epilepsy, laryngeal epilepsy, laryngospasm,
   lash into fury, latent epilepsy, lather up, light the fuse,
   light up, lockjaw, mad, madden, madness, make mad, mania,
   matutinal epilepsy, maze, menstrual epilepsy, mess, mist, move,
   muddle, muddlement, murderous insanity, musicogenic epilepsy,
   myoclonous epilepsy, nocturnal epilepsy, occlusion, orgasm, orgy,
   outburst, overambitiousness, overanxiety, overanxiousness,
   overeagerness, overenthusiasm, overexcite, overzealousness,
   pandemonium, paroxysm, passion, perplexity, perturbation,
   petit mal, physiologic epilepsy, pother, psychic epilepsy,
   psychokinesia, psychomotor epilepsy, pucker, racket, rage, rapture,
   ravishment, reflex epilepsy, rotatoria, rouse, row, ruckus, ruffle,
   rumpus, seizure, send mad, sensory epilepsy, serial epilepsy,
   set astir, set fire to, set on fire, shatter, shuffle, spasm,
   steam up, stew, stir, stir the blood, stir the embers,
   stir the feelings, stir up, stoppage, storminess, stroke,
   summon up, sweat, swivet, tardy epilepsy, tearing passion,
   tempestuousness, tetanus, tetany, throes, thromboembolism,
   thrombosis, tizzy, tonic epilepsy, tonic spasm, torsion spasm,
   towering rage, transport, traumatic epilepsy, trismus, tumult,
   tumultuousness, turbulence, turmoil, turn on, ucinate epilepsy,
   unbalance, unhinge, unsettlement, uproar, upset, visitation, wake,
   wake up, waken, warm, warm the blood, whip up, wildness, work into,
   work up, zeal, zealotism, zealotry, zealousness