dolittle

Do-little \Do"-lit`tle\, n.
   One who performs little though professing much. [Colloq.]
   [1913 Webster]

         Great talkers are commonly dolittles.    --Bp.
                                                  Richardson.
   [1913 Webster]
    

38 Moby Thesaurus words for "dolittle":
      bum, clock watcher, dallier, dawdle, dawdler, diddler,
      dillydallier, do-nothing, doodler, faineant, gentleman of leisure,
      goldbrick, goldbricker, goof-off, idler, laggard, lazybones,
      lingerer, loafer, loiterer, loller, lotus-eater, lounger, lubber,
      mope, moper, potterer, putterer, slouch, sloucher, slug, slugabed,
      sluggard, stick-in-the-mud, time killer, time waster, trifler,
      waiter on Providence