The Collaborative International Dictionary of English v.0.48:

Condign \Con*dign"\, a. [F. condigne, L. condignus very worthy;
   con- + dignus worthy. See Deign, and cf. Digne.]
   1. Worthy; suitable; deserving; fit. [Obs.]
      [1913 Webster]

            Condign and worthy praise.            --Udall.
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            Herself of all that rule she deemend most condign.
                                                  --Spenser.
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   2. Deserved; adequate; suitable to the fault or crime.
      "Condign censure." --Milman.
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            Unless it were a bloody murderer . . .
            I never gave them condign punishment. --Shak.
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WordNet (r) 3.0 (2006):

condign
    adj 1: fitting or appropriate and deserved; used especially of
           punishment; "condign censure"

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "condign":
   according to Hoyle, appropriate, atrocious, awful, becoming,
   correct, decent, decorous, deserved, dreadful, due, fair, fit,
   fitting, good, grim, horrible, just, kosher, merited, nice, normal,
   normative, proper, requisite, right, right and proper, righteous,
   rightful, rigorous, seemly, stern, strict, stringent, suitable