The Collaborative International Dictionary of English v.0.48:

Barbarian \Bar*ba"ri*an\, n. [See Barbarous.]
   [1913 Webster]
   1. A foreigner. [Historical]
      [1913 Webster]

            Therefore if I know not the meaning of the voice, I
            shall be unto him that speaketh a barbarian, and he
            that speaketh shall be a barbarian unto me. --1 Cor.
                                                  xiv. 11.
      [1913 Webster]

   2. A man in a rude, savage, or uncivilized state.
      [1913 Webster]

   3. A person destitute of culture. --M. Arnold.
      [1913 Webster]

   4. A cruel, savage, brutal man; one destitute of pity or
      humanity. "Thou fell barbarian." --Philips.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barbarian \Bar*ba"ri*an\, a.
   Of, or pertaining to, or resembling, barbarians; rude;
   uncivilized; barbarous; as, barbarian governments or nations.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barbarian
    adj 1: without civilizing influences; "barbarian invaders";
           "barbaric practices"; "a savage people"; "fighting is
           crude and uncivilized especially if the weapons are
           efficient"-Margaret Meade; "wild tribes" [syn:
           barbarian, barbaric, savage, uncivilized,
           uncivilised, wild]
    n 1: a member of an uncivilized people [syn: savage,
         barbarian]
    2: a crude uncouth ill-bred person lacking culture or refinement
       [syn: peasant, barbarian, boor, churl, Goth,
       tyke, tike]

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "barbarian":
   Goth, Gothic, Neanderthal, Uitlander, alien, animal,
   anthropophagite, backward, barbaric, barbarous, beast, bestial,
   bloodthirsty, boor, boorish, brutal, brute, brutish, cannibal,
   churl, churlish, clod, coarse, crude, cruel, deracine, destroyer,
   displaced person, emigre, exile, exotic, exterior, external,
   extraneous, extraterrestrial, extrinsic, ferocious, foreign,
   foreign devil, foreign-born, foreigner, graceless, gringo,
   heathenish, hooligan, hyena, ignoramus, ill-bred, ill-mannered,
   impolite, inhuman, insensitive, intrusive, lout, loutish, lowbrow,
   man-eater, nihilist, noncivilized, oaf, oafish, outland, outlander,
   outlandish, outlaw, outside, outsider, philistine, primitive,
   refugee, rough, rough-and-ready, rude, ruffian, savage, shark,
   skinhead, strange, stranger, tasteless, the Wandering Jew, tiger,
   tough, tramontane, troglodyte, troglodytic, ulterior, ultramontane,
   uncivil, uncivilized, uncombed, uncouth, uncultivated, uncultured,
   unearthly, unkempt, unlicked, unpolished, unrefined, untamed,
   vandal, vandalic, vulgar, wanderer, wild, wild man, wrecker,
   yahoo



Easton's 1897 Bible Dictionary:

Barbarian
   a Greek word used in the New Testament (Rom. 1:14) to denote one
   of another nation. In Col. 3:11, the word more definitely
   designates those nations of the Roman empire that did not speak
   Greek. In 1 Cor. 14:11, it simply refers to one speaking a
   different language. The inhabitants of Malta are so called (Acts
   28:1,2, 4). They were originally a Carthaginian colony. This
   word nowhere in Scripture bears the meaning it does in modern
   times.