intriguing

from WordNet (r) 3.0 (2006)

intriguing
    adj 1: disturbingly provocative; "an intriguing smile" [syn:
           {challenging}, {intriguing}]
    2: capable of arousing interest or curiosity; "our team came up
       with some most intriguing finds"

from The Collaborative International Dictionary of English v.0.48

Intrigue \In*trigue"\ ([i^]n*tr[=e]g"), v. i. [imp. & p. p.
   {Intrigued} (-tr[=e]gd"); p. pr. & vb. n. {Intriguing}.] [F.
   intriguer, OF. intriquer, entriquer; cf. It. intrigare. See
   {Intricate}, {Extricate}.]
   1. To form a plot or scheme; to contrive to accomplish a
      purpose by secret artifice.
      [1913 Webster]

   2. To carry on a secret and illicit love or amour.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

75 Moby Thesaurus words for "intriguing":
      Byzantine, Machiavellian, alluring, appealing, appetizing,
      attractive, beguiling, bewitching, blandishing, cajoling,
      calculating, captivating, catching, charismatic, charming, coaxing,
      collusive, come-hither, connivent, conniving, conspiring,
      contriving, coquettish, delightful, designing, enchanting,
      engaging, enravishing, enthralling, enticing, entrancing, exciting,
      exotic, exquisite, fascinating, fetching, flirtatious, glamorous,
      heart-robbing, hypnotic, interesting, inviting, irresistible,
      lovely, luxurious, mesmeric, mouth-watering, piquant, plotting,
      prepossessing, provocative, provoquant, ravishing, scheming,
      seducing, seductive, sensuous, siren, sirenic, spellbinding,
      spellful, stratagemical, taking, tantalizing, teasing, tempting,
      thrilling, tickling, titillating, titillative, up to, voluptuous,
      winning, winsome, witching