Nawathinehena is an extinct
Algonquian language formerly spoken among the
Arapaho people. It had a
phonological development quite different from either
Gros Ventre or
Arapaho proper. It has been identified as the former language of the Southern Arapaho, who switched to speaking Arapaho proper in the 19th century. However, the language is not well attested, being documented only in a vocabulary collected in 1899 by
Alfred L. Kroeber from the Oklahoma Arapaho.