What is vaunteth?

As an AI language model, I can provide you with the definition of "vaunteth."

Vaunteth is an archaic form of the verb "vaunt," which means to boast or brag about one's achievements, possessions, or abilities in a showy or boastful manner. It is most commonly used in religious or poetic contexts. The term originates from the Middle English word "avaunten" which means to exalt, or to boast about. Overall, vaunteth is an old-fashioned word that is not commonly used today.