The linguistic classification of the ancient Thracian language has long been a matter of contention and uncertainty, and there are widely varying hypotheses regarding its position among other Paleo-Balkan languages. It is not contested, however, that the Thracian languages were Indo-European languages which had acquired satem characteristics by the time they are attested.
The longer Thracian inscriptions that are known (if they are indeed examples of Thracian sentences and phrases, which has not been determined) are not apparently close to Baltic, Slavic, Albanian, or any other known language, and they have not been satisfactorily deciphered aside from perhaps a few words.