Jacundá is an extinct, unclassified language formerly spoken by the Jacundá people. Only two proper names are known from it.
Name The name "Jacundá" is that of the Crenicichla genus of fish.
Vocabulary Two Jacundá names among those of chiefs along the Araguaia River recorded in 1793 are recorded from the Jacundá language: , which the German-Brazilian ethnologist Curt Nimuendajú etymologized as Tupian , and , which Nimuendajú claimed was "contrary to Tupí phonetics". He left Jacundá unclassified in his ethnolinguistic map of 1948. Nevertheless, the Czech linguist Čestmír Loukotka (1968) classified it as a Tupian language in his "Pará Group", with the Anambé, Xingu Asurini, Takunyapé, Tapajó, and Parakanã languages.
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