asinine

asinine
    adj 1: devoid of intelligence [syn: {asinine}, {fatuous},
           {inane}, {mindless}, {vacuous}]
    

Asinine \As"i*nine\, a. [L. asininus, fr. asinus ass. See
   {Ass}.]
   Of or belonging to, or having the qualities of, the ass, as
   stupidity and obstinacy. "Asinine nature." --B. Jonson.
   "Asinine feast." --Milton.
   [1913 Webster]
    

127 Moby Thesaurus words for "asinine":
      Boeotian, absurd, airy, apish, batty, beef-brained, beef-witted,
      befooled, beguiled, besotted, blockish, bovid, bovine, brainless,
      buffoonish, caprid, caprine, catchpenny, chumpish, cloddish,
      cockeyed, cowish, cowlike, crass, crazy, credulous, daffy, daft,
      dazed, deerlike, dense, dizzy, doltish, doting, dullard, dumb,
      duncical, duncish, empty, equestrian, equine, fat, fatuitous,
      fatuous, flaky, flimsy, fond, fool, foolheaded, foolish, fribble,
      fribbling, frivolous, frothy, fuddled, futile, gaga, goatish,
      goatlike, goofy, gross, gulled, hircine, hoggish, hoofed, horsy,
      idiotic, idle, imbecile, inane, ineducable, inept, infatuated,
      insane, irrational, klutzy, kooky, light, loony, lumpish, mad,
      maudlin, mindless, moronic, mulish, nugacious, nugatory, nutty,
      oafish, opaque, otiose, ovine, piggish, puerile, ruminant, sappy,
      screwy, senseless, sentimental, shallow, sheepish, sheeplike,
      silly, slender, slight, sottish, stupid, superficial, swinish,
      thick, thoughtless, trifling, trite, trivial, ungulate,
      unreasonable, unteachable, unwitty, vacuous, vain, vapid, wacky,
      weak-minded, wet, windy, witless, wrongheaded