Source : Webster's Revised Unabridged Dictionary (1913)

Lamentable \Lam"en*ta*ble\, a. [L. lamentabilis : cf. F.
   lamentable.]
   1. Mourning; sorrowful; expressing grief; as, a lamentable
      countenance. ``Lamentable eye.'' --Spenser.

   2. Fitted to awaken lament; to be lamented; sorrowful;
      pitiable; as, a lamentable misfortune, or error.
      ``Lamentable helplessness.'' --Burke.

   3. Miserable; pitiful; paltry; -- in a contemptuous or
      ridiculous sense. --Bp. Stillingfleet. --
      {Lam"en*ta*ble*ness}, n. -- {Lam"en*ta*bly}, adv.

Source : WordNet®

lamentably
     adv : in an unfortunate or deplorable manner; "he was sadly
           neglected"; "it was woefully inadequate" [syn: {deplorably},
            {sadly}, {woefully}]