tomfool

from WordNet (r) 3.0 (2006)

tomfool
    n 1: a person who lacks good judgment [syn: {fool}, {sap},
         {saphead}, {muggins}, {tomfool}]

from The Collaborative International Dictionary of English v.0.48

Tomfool \Tom"fool`\ (t[o^]m"f[=oo]l`), n. [Tom (see {Tomboy}) +
   fool.]
   A great fool; a trifler.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

34 Moby Thesaurus words for "tomfool":
      absurd, ass, balmy, born fool, buffoon, clown, crazy, donkey,
      doodle, egregious ass, fantastic, figure of fun, fool, harebrained,
      idiot, ignoramus, imbecile, insane, jackass, jerk, loony, lunatic,
      milksop, mooncalf, nincompoop, ninny, perfect fool, preposterous,
      schmuck, silly, softhead, sop, stupid ass, zany