windbag

from WordNet (r) 3.0 (2006)

windbag
    n 1: a boring person who talks a great deal about uninteresting
         topics [syn: {gasbag}, {windbag}]

from Moby Thesaurus II by Grady Ward, 1.0

41 Moby Thesaurus words for "windbag":
      Captain Bobadil, Gascon, Texan, agreeable rattle, babbler,
      big mouth, big talker, blab, blabberer, blatherer, blower,
      blowhard, blusterer, boaster, brag, braggadocio, braggart,
      chatterbox, chatterer, fanfaron, gabber, gabbler, gasbag,
      gasconader, gibble-gabbler, great talker, hector, hot-air artist,
      idle chatterer, jabberer, jay, magpie, miles gloriosus,
      moulin a paroles, patterer, prater, prattler, rattle, windjammer,
      windy, word-slinger