Source : Webster's Revised Unabridged Dictionary (1913)

Wicked \Wicked\, a.
   Having a wick; -- used chiefly in composition; as, a
   two-wicked lamp.

Wicked \Wick"ed\, a. [OE. wicked, fr. wicke wicked; probably
   originally the same word as wicche wizard, witch. See
   {Witch}.]
   1. Evil in principle or practice; deviating from morality;
      contrary to the moral or divine law; addicted to vice or
      sin; sinful; immoral; profligate; -- said of persons and
      things; as, a wicked king; a wicked woman; a wicked deed;
      wicked designs.

            Hence, then, and evil go with thee along, Thy
            offspring, to the place of evil, hell, Thou and thy
            wicked crew!                          --Milton.

            Never, never, wicked man was wise.    --Pope.

   2. Cursed; baneful; hurtful; bad; pernicious; dangerous.
      [Obs.] ``Wicked dew.'' --Shak.

            This were a wicked way, but whoso had a guide. --P.
                                                  Plowman.

   3. Ludicrously or sportively mischievous; disposed to
      mischief; roguish. [Colloq.]

            Pen looked uncommonly wicked.         --Thackeray.

   Syn: Iniquitous; sinful; criminal; guilty; immoral; unjust;
        unrighteous; unholy; irreligious; ungodly; profane;
        vicious; pernicious; atrocious; nefarious; heinous;
        flagrant; flagitious; abandoned. See {Iniquitous}.

Source : WordNet®

wicked
     adj 1: morally bad in principle or practice [ant: {virtuous}]
     2: having committed unrighteous acts; "a sinful person" [syn: {sinful},
         {unholy}]
     3: intensely or extremely bad or unpleasant in degree or
        quality; "severe pain"; "a severe case of flu"; "a
        terrible cough"; "under wicked fire from the enemy's
        guns"; "a wicked cough" [syn: {severe}, {terrible}]
     4: morally bad or wrong; "evil purposes"; "an evil influence";
        "evil deeds" [syn: {evil}] [ant: {good}]
     5: highly offensive; arousing aversion or disgust; "a
        disgusting smell"; "distasteful language"; "a loathsome
        disease"; "the idea of eating meat is repellent to me";
        "revolting food"; "a wicked stench" [syn: {disgusting}, {disgustful},
         {distasteful}, {foul}, {loathly}, {loathsome}, {repellent},
         {repellant}, {repelling}, {revolting}, {skanky}, {yucky}]