The Collaborative International Dictionary of English v.0.48:

Shameful \Shame"ful\, a.
   1. Bringing shame or disgrace; injurious to reputation;
      disgraceful.
      [1913 Webster]

            His naval preparations were not more surprising than
            his quick and shameful retreat.       --Arbuthnot.
      [1913 Webster]

   2. Exciting the feeling of shame in others; indecent; as, a
      shameful picture; a shameful sight. --Spenser.
      [1913 Webster]

   Syn: Disgraceful; reproachful; indecent; unbecoming;
        degrading; scandalous; ignominious; infamous.
        [1913 Webster] -- Shame"ful*ly, adv. --
        Shame"ful*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

shamefully
    adv 1: in a dishonorable manner or to a dishonorable degree;
           "his grades were disgracefully low" [syn:
           disgracefully, ingloriously, ignominiously,
           discreditably, shamefully, dishonorably,
           dishonourably]