The Collaborative International Dictionary of English v.0.48:

Overwork \O`ver*work"\, v. t. [imp. & p. p. Overworkedor
   Overwrought; p. pr. & vb. n. Overworking.]
   1. To work beyond the strength; to cause to labor too much or
      too long; to tire excessively; as, to overwork a horse.
      [1913 Webster]

   2. To fill too full of work; to crowd with labor.
      [1913 Webster]

            My days with toil are overwrought.    --Longfellow.
      [1913 Webster]

   3. To decorate all over.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "overworked":
   arabesque, baroque, busy, chichi, commonplace, elaborate, elegant,
   fancy, fine, flamboyant, florid, flowery, frilly, fussy, hackneyed,
   high-wrought, labored, luxuriant, luxurious, moresque, ornate,
   ostentatious, overelaborate, overelegant, overlabored, overwrought,
   picturesque, platitudinous, pretty-pretty, rich, rococo,
   stereotyped, trite, truistic