High Tubenian is the language spoken in a phase of Tubenian history that, judging by the king list, represents its highest flowering, with long unbroken dynasties. It is an ergative, agglutinating language with numerous nominal cases and moods and aspects of verbs. There is no verbal tense, however, and the nouns are grouped in only four different classes with small differences in morphology.
Tubenian never developed any alphabetic script, but there are as yet uninterpreted symbol stones with something looking like pictographic writing.