The Collaborative International Dictionary of English v.0.48:

Violent \Vi"o*lent\, a. [F., from L. violentus, from vis
   strength, force; probably akin to Gr. ? a muscle, strength.]
   1. Moving or acting with physical strength; urged or impelled
      with force; excited by strong feeling or passion;
      forcible; vehement; impetuous; fierce; furious; severe;
      as, a violent blow; the violent attack of a disease.
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            Float upon a wild and violent sea.    --Shak.
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            A violent cross wind from either coast. --Milton.
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   2. Acting, characterized, or produced by unjust or improper
      force; outrageous; unauthorized; as, a violent attack on
      the right of free speech.
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            To bring forth more violent deeds.    --Milton.
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            Some violent hands were laid on Humphrey's life.
                                                  --Shak.
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   3. Produced or effected by force; not spontaneous; unnatural;
      abnormal.
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            These violent delights have violent ends. --Shak.
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            No violent state can be perpetual.    --T. Burnet.
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            Ease would recant
            Vows made in pain, as violent and void. --Milton.
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   Violent presumption (Law), presumption of a fact that
      arises from proof of circumstances which necessarily
      attend such facts.

   Violent profits (Scots Law), rents or profits of an estate
      obtained by a tenant wrongfully holding over after
      warning. They are recoverable in a process of removing.
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   Syn: Fierce; vehement; outrageous; boisterous; turbulent;
        impetuous; passionate; severe; extreme.
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The Collaborative International Dictionary of English v.0.48:

Violent \Vi"o*lent\, n.
   An assailant. [Obs.] --Dr. H. More.
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The Collaborative International Dictionary of English v.0.48:

Violent \Vi"o*lent\, v. t. [Cf. F. violenter.]
   To urge with violence. [Obs.] --Fuller.
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The Collaborative International Dictionary of English v.0.48:

Violent \Vi"o*lent\, v. i.
   To be violent; to act violently. [Obs.]
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         The grief is fine, full, perfect, that I taste,
         And violenteth in a sense as strong
         As that which causeth it.                --Shak.
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WordNet (r) 3.0 (2006):

violent
    adj 1: acting with or marked by or resulting from great force or
           energy or emotional intensity; "a violent attack"; "a
           violent person"; "violent feelings"; "a violent rage";
           "felt a violent dislike" [ant: nonviolent]
    2: effected by force or injury rather than natural causes; "a
       violent death"
    3: (of colors or sounds) intensely vivid or loud; "a violent
       clash of colors"; "her dress was a violent red"; "a violent
       noise"; "wild colors"; "wild shouts" [syn: violent, wild]
    4: marked by extreme intensity of emotions or convictions;
       inclined to react violently; fervid; "fierce loyalty"; "in a
       tearing rage"; "vehement dislike"; "violent passions" [syn:
       fierce, tearing, vehement, violent, trigger-happy]
    5: characterized by violence or bloodshed; "writes of crimson
       deeds and barbaric days"- Andrea Parke; "fann'd by Conquest's
       crimson wing"- Thomas Gray; "convulsed with red rage"- Hudson
       Strode [syn: crimson, red, violent]

Moby Thesaurus II by Grady Ward, 1.0:

205 Moby Thesaurus words for "violent":
   Dionysiac, Mafioso, Young Turk, abandoned, acid, acidulous, acrid,
   acrimonious, acute, amok, astringent, bacchic, barbarous, beast,
   beastly, beldam, bellowing, berserk, berserker, biting, bitter,
   bomber, brutal, brute, brutish, bulldozer, carried away,
   cataclysmic, catastrophic, caustic, coercive, concentrated,
   corybantic, crazed, cruel, cutting, damaging, deleterious,
   delirious, demon, demoniac, desperate, destructive, detrimental,
   devastating, devil, distracted, double-edged, dragon, drastic,
   ecstatic, edged, energetic, enraptured, escharotic, excessive,
   exorbitant, exquisite, extravagant, extreme, feral, ferocious,
   fiend, fierce, fiery, fire-eater, firebrand, forceful, forcible,
   frantic, frenetic, frenzied, fulminating, furious, fury, goon,
   gorilla, great, gunsel, haggard, hardnose, harmful, harsh,
   hell-raiser, hellcat, hellhound, hellion, hog-wild, holy terror,
   hood, hoodlum, hothead, hotheaded, hotspur, howling, hysterical,
   immoderate, impetuous, in a transport, in hysterics, incendiary,
   incisive, inhuman, injurious, inordinate, insane, intemperate,
   intense, intoxicated, irrational, keen, killer, like one possessed,
   mad, mad dog, madcap, madding, maenadic, maniac, maniacal, mean,
   mighty, monster, mordacious, mordant, mugger, nasty, orgasmic,
   orgiastic, outrageous, passionate, penetrating, physical, piercing,
   poignant, possessed, potent, powerful, rabid, raging, ramping,
   ranting, rapist, raving, raving mad, ravished, revolutionary,
   rigorous, roaring, rough, ruinous, running mad, running wild,
   savage, scathing, serious, severe, sharp, she-wolf, simmering,
   sledgehammer, spitfire, splitting, stabbing, stark-raving mad,
   steamroller, stinging, storming, stormy, strident, stringent,
   strong, strong-arm, tart, tempestuous, termagant, terrible, terror,
   terrorist, tiger, tigress, tornadic, tough, tough guy, transported,
   trenchant, ugly customer, unconscionable, uncontrollable,
   ungovernable, untamed, vehement, venomous, vicious, virago,
   virulent, vitriolic, vixen, volcanic, wild, wild beast, wild-eyed,
   wild-looking, witch, wolf