The Collaborative International Dictionary of English v.0.48:

Pungent \Pun"gent\, a. [L. pungens, -entis, p. pr. of pungere,
   punctum, to prick. Cf. Compunction, Expunge, Poignant,
   Point, n., Puncheon, Punctilio, Punt, v. t.]
   1. Causing a sharp sensation, as of the taste, smell, or
      feelings; pricking; biting; acrid; as, a pungent spice.
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            Pungent radish biting infant's tongue. --Shenstone.
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            The pungent grains of titillating dust. --Pope.
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   2. Sharply painful; penetrating; poignant; severe; caustic;
      stinging.
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            With pungent pains on every side.     --Swift.
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            His pungent pen played its part in rousing the
            nation.                               --J. R. Green.
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   3. (Bot.) Prickly-pointed; hard and sharp.
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   Syn: Acrid; piercing; sharp; penetrating; acute; keen;
        acrimonious; biting; stinging.
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Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "pungent":
   Attic, acerb, acerbate, acerbic, acescent, acid, acrid,
   acrimonious, acute, afflictive, agonizing, amaroidal, aphoristic,
   aromatic, asperous, astringent, atrocious, axiomatic, barbed,
   biting, bitter, bitter as gall, brilliant, caustic, clever, coarse,
   consuming, crab, crabbed, cramping, crisp, cruel, cutting,
   deafening, distressing, droll, dry, epigrammatic, escharotic,
   exciting, excruciating, facetious, flavorful, formulaic,
   formulistic, funny, gnawing, gnomic, grave, green, griping, hard,
   harrowing, harsh, hot, humorous, humorsome, hurtful, hurting,
   incisive, intense, irritating, jesting, jocose, jocular, joking,
   joky, joshing, keen, keen-witted, lively, loud, mordant,
   nimble-witted, nose-piercing, nose-tickling, oppressive, painful,
   paroxysmal, penetrating, peppery, peppy, pickled, piercing,
   piquant, pithy, platitudinous, poignant, pointed, proverbial,
   provocative, quick-witted, racking, racy, rapier-like, reeking,
   rich, rough, salt, salty, sapid, sarcastic, scathing,
   scintillating, seasoned, sec, sententious, severe, sharp, shooting,
   smart, snappy, sour, sour as vinegar, soured, sourish, sparkling,
   spasmatic, spasmic, spasmodic, spicy, spirited, sprightly,
   stabbing, stern, stimulating, stinging, strong, strong-scented,
   strong-smelling, succinct, suffocating, tangy, tart, tartish,
   tasty, terse, thundering, tormenting, torturous, trenchant,
   uninteresting, unripe, unsweet, unsweetened, upsetting, vinegarish,
   vinegary, vitriolic, vivacious, whimsical, witty, zesty