Rimba language
Rimba (Irimba) is the speech variety of the Babongo-Rimba pygmies of Gabon. Generally considered a dialect of Punu, it may preserve a core of non-Bantu vocabulary, and so to be conservative should be considered unclassified.
References
- "Towards a new classification of African languages", Linguistic Contribution to the History of Sub-Saharan Africa, University of Lyons