The Collaborative International Dictionary of English v.0.48:

Bewail \Be*wail"\, v. t. [imp. & p. p. Bewailed; p. pr. & vb.
   n. Bewailing.]
   To express deep sorrow for, as by wailing; to lament; to wail
   over.
   [1913 Webster]

         Hath widowed and unchilded many a one,
         Which to this hour bewail the injury.    --Shak.
   [1913 Webster]

   Syn: To bemoan; grieve. -- See Deplore.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bewail \Be*wail"\, v. i.
   To express grief; to lament. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bewail
    v 1: regret strongly; "I deplore this hostile action"; "we
         lamented the loss of benefits" [syn: deplore, lament,
         bewail, bemoan]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "bewail":
   be sorry for, bemoan, deplore, dirge, elegize, give sorrow words,
   grieve, keen, knell, lament, moan, mourn, regret, repine, rue,
   rue the day, sigh, sing the blues, sorrow, weep, weep over