The Collaborative International Dictionary of English v.0.48:

dogmatic \dog*mat"ic\ (d[o^]g*m[a^]t"[i^]k), n.
   One of an ancient sect of physicians who went by general
   principles; -- opposed to the Empiric. dogmatic

The Collaborative International Dictionary of English v.0.48:

dogmatic \dog*mat"ic\ (d[o^]g*m[a^]t"[i^]k), dogmatical
\dog*mat`ic*al\ (d[o^]g*m[a^]t"[i^]*kal), a. [L. dogmaticus, Gr.
   dogmatiko`s, fr. do`gma: cf. F. dogmatique.]
   1. Pertaining to a dogma, or to an established and authorized
      doctrine or tenet.
      [1913 Webster]

   2. Asserting a thing positively and authoritatively;
      positive; magisterial; hence, arrogantly authoritative;
      overbearing.
      [1913 Webster]

            Critics write in a positive, dogmatic way. --
                                                  Spectator.
      [1913 Webster]

            [They] are as assertive and dogmatical as if they
            were omniscient.                      -- Glanvill.
      [1913 Webster]

   Dogmatic theology. Same as Dogmatics.

   Syn: Magisterial; arrogant. See Magisterial.
        [1913 Webster]

WordNet (r) 3.0 (2006):

dogmatic
    adj 1: characterized by assertion of unproved or unprovable
           principles [syn: dogmatic, dogmatical]
    2: of or pertaining to or characteristic of a doctrine or code
       of beliefs accepted as authoritative
    3: relating to or involving dogma; "dogmatic writings"

Moby Thesaurus II by Grady Ward, 1.0:

133 Moby Thesaurus words for "dogmatic":
   Sabbatarian, a priori, antiblack, arbitrary, arrogant, assertive,
   assured, authoritarian, authoritative, balking, balky, believing,
   biased, bigoted, blind, bulldogged, bulletheaded, bullheaded,
   canonical, case-hardened, categorical, certain, chauvinistic,
   colored, conceited, confessional, confident, convinced, creedal,
   creedbound, deaf, deducible, derivable, devout, dictatorial,
   doctrinaire, doctrinal, doctrinarian, dogged, dogmatizing,
   domineering, doubtless, emphatic, evangelical, faithful, fanatic,
   fideistic, fundamentalist, hardheaded, headstrong, hidebound,
   hyperorthodox, imperious, impressed with, influenced, insistent,
   interested, intolerant, jaundiced, know-nothing, literalist,
   literalistic, magisterial, mulish, nonobjective, obdurate,
   obstinate, one-sided, opinionated, opinionative, opinioned,
   oracular, overbearing, overzealous, partial, partisan, peremptory,
   persevering, persuaded, pertinacious, pietistic, pigheaded, pious,
   pistic, pontifical, positive, positivistic, precisianist,
   precisianistic, prejudiced, prepossessed, pronunciative, purist,
   puristic, puritanical, pushy, racist, reasoned, restive, satisfied,
   secure, self-opinionated, self-opinioned, self-willed, set, sexist,
   sold on, staunch, stiff-necked, straitlaced, strict, strong-willed,
   strongheaded, stubborn, sulky, sullen, superpatriotic, sure,
   swayed, tenacious, twisted, ultranationalist, uncooperative,
   under the impression, undetached, undispassionate, undoubtful,
   undoubting, unpersuadable, unregenerate, warped, willful,
   xenophobic