The Collaborative International Dictionary of English v.0.48:

Deplore \De*plore"\, v. t. [imp. & p. p. Deplored; p. pr. &
   vb. n. Deploring.] [L. deplorare; de- + plorare to cry out,
   wail, lament; prob. akin to pluere to rain, and to E. flow:
   cf. F. d['e]plorer. Cf. Flow.]
   1. To feel or to express deep and poignant grief for; to
      bewail; to lament; to mourn; to sorrow over.
      [1913 Webster]

            To find her, or forever to deplore
            Her loss.                             --Milton.
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            As some sad turtle his lost love deplores. --Pope.
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   2. To complain of. [Obs.] --Shak.
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   3. To regard as hopeless; to give up. [Obs.] --Bacon.

   Syn: To Deplore, Mourn, Lament, Bewail, Bemoan.

   Usage: Mourn is the generic term, denoting a state of grief
          or sadness. To lament is to express grief by outcries,
          and denotes an earnest and strong expression of
          sorrow. To deplore marks a deeper and more prolonged
          emotion. To bewail and to bemoan are appropriate only
          to cases of poignant distress, in which the grief
          finds utterance either in wailing or in moans and
          sobs. A man laments his errors, and deplores the ruin
          they have brought on his family; mothers bewail or
          bemoan the loss of their children.
          [1913 Webster]