The Collaborative International Dictionary of English v.0.48:

Dignified \Dig"ni*fied\, a.
   Marked with dignity; stately; as, a dignified judge.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

dignify \dig"ni*fy\, v. t. [imp. & p. p. Dignified; p. pr. &
   vb. n. Dignifying.] [OF. dignifier, fr. LL. dignificare; L.
   dignus worthy + ficare (in comp.), facere to make. See
   Deign, and Fact.]
   To invest with dignity or honor; to make illustrious; to give
   distinction to; to exalt in rank; to honor.
   [1913 Webster]

         Your worth will dignify our feast.       --B. Jonson.

   Syn: To exalt; elevate; prefer; advance; honor; illustrate;
        adorn; ennoble.
        [1913 Webster]

WordNet (r) 3.0 (2006):

dignified
    adj 1: having or expressing dignity; especially formality or
           stateliness in bearing or appearance; "her dignified
           demeanor"; "the director of the school was a dignified
           white-haired gentleman" [ant: undignified]
    2: having or showing self-esteem [syn: dignified, self-
       respecting, self-respectful]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "dignified":
   aristocratic, august, courtly, distingue, distinguished, elegant,
   elevated, exalted, formal, grand, grave, honorable, imposing,
   inspiring, kingly, lofty, lordly, magisterial, majestic, moving,
   noble, princely, queenly, regal, reserved, royal, sedate, serious,
   sober, solemn, stately, statuesque, sublime, venerable, weighty,
   worthy