The Collaborative International Dictionary of English v.0.48:

Sensational \Sen*sa"tion*al\, a.
   1. Of or pertaining to sensation; as, sensational nerves.
      [1913 Webster]

   2. Of or pertaining to sensationalism, or the doctrine that
      sensation is the sole origin of knowledge.
      [1913 Webster]

   3. Suited or intended to excite temporarily great interest or
      emotion; melodramatic; emotional; as, sensational plays or
      novels; sensational preaching; sensational journalism; a
      sensational report.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sensational
    adj 1: causing intense interest, curiosity, or emotion [ant:
           unsensational]
    2: commanding attention; "an arresting drawing of people turning
       into animals"; "a sensational concert--one never to be
       forgotten"; "a stunning performance" [syn: arresting,
       sensational, stunning]
    3: relating to or concerned in sensation; "the sensory cortex";
       "sensory organs" [syn: sensational, sensory]

Moby Thesaurus II by Grady Ward, 1.0:

211 Moby Thesaurus words for "sensational":
   Barnumesque, Gongoresque, Johnsonian, acid, affected, amazing,
   arresting, astonishing, astounding, bedizened, beguiling,
   bewildering, big-sounding, biting, blatant, brazen, brazenfaced,
   breathtaking, cloak-and-dagger, coarse, colored, colorful,
   conspicuous, convoluted, cool, corrosive, crashing, crude, cutting,
   dandy, declamatory, divine, dramatic, driving, effective,
   electrifying, elevated, emotionalistic, emotive, enigmatic,
   euphuistic, exaggerated, exceptional, exciting, exquisite,
   extraordinary, extravagant, extreme, fabulous, fantastic,
   fascinating, flagrant, flamboyant, flaming, flaring, flashy,
   flaunting, forceful, forcible, fulsome, galvanizing, garish, gaudy,
   gilt-edged, glaring, glorious, golden, gorgeous, grandiloquent,
   grandiose, grandisonant, great, groovy, gutsy, hair-raising, hammy,
   heavenly, high-flowing, high-flown, high-flying, high-sounding,
   highfalutin, histrionic, hot, hunky-dory, hysteric, immense,
   imperative, impressive, incisive, incomprehensible, inconceivable,
   incredible, inkhorn, juicy, keen, labyrinthine, lexiphanic, livid,
   lofty, loud, lurid, magnificent, magniloquent, marked, marvelous,
   matchless, melodramatic, meretricious, mind-blowing, mind-boggling,
   miraculous, mordant, nervous, nonpareil, nonrational, obtrusive,
   orotund, ostentatious, outlandish, outstanding, overdone,
   overdrawn, overelaborate, overemotional, overinvolved, overwrought,
   passing strange, pedantic, peerless, penetrating, phenomenal,
   piercing, piquant, poignant, pointed, pompous, powerful,
   pretentious, prodigious, prominent, punchy, pungent, puzzling,
   rare, remarkable, rhetorical, rousing, salient, screaming,
   sensationalistic, sensatory, sensitive, sensorial, sensual,
   sententious, shameless, shocking, showy, signal, sinewed, sinewy,
   slashing, smash, smashing, sonorous, spectacular, spine-chilling,
   splendid, splendiferous, staggering, sterling, stilted,
   stimulating, stirring, strange, striking, strong, stunning,
   stupendous, sultry, super, superb, supereminent, superexcellent,
   superfine, superior, tabloid, tall, tawdry, telling, terrific,
   theatrical, thrilling, tortuous, tremendous, trenchant,
   unbelievable, unheard-of, unimaginable, unique, unprecedented,
   unreasoning, very good, vigorous, vital, vivid, vulgar, wonderful,
   wondrous, yellow