LATIN DICTIONARYLexicon Latīnum
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“barbarian” in Latin

The English word barbarian itself goes back to Latin barbarus, through barbarinus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

barbarian
barbarus (foreign, with the accessory notion of the want of civilization): rudis, hebes et impolitns; humanitatis expers.
Cruel, immanis ac barbarus: like a barbarian, barbare; inhumane; saeve; crudeliter: to speak like a barbarian, barbare loqui: the speech of a barbarian, sermo horridulus atque incomtus.

Quick answer

What is the Latin word for barbarian?
The usual Latin words for “barbarian” are barbarus, rudis, inhūmānus; also saevus, crūdēlis. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.