The Malayo-Sumbawan languages are a proposed subgroup of the Austronesian languages that unites the Malayic and Chamic languages with the languages of Java and the western Lesser Sunda Islands (western Indonesia), except for Javanese (Adelaar 2005). If valid, it would be the largest demonstrated family of Malayo-Polynesian outside Oceanic. The Malayo-Sumbawan subgroup is however not universally accepted, and is rejected e.g. by Blust (2010) and Smith (2017), who supported the Greater North Borneo and Western Indonesian hypotheses. In a 2019 paper published in Oceanic Linguistics, Adelaar accepted both of these groupings, in addition to Smith's (2018) redefinition of Barito languages as forming a linkage.