The Collaborative International Dictionary of English v.0.48:
Neanderthalian \Neanderthalian\ adj. same as Neanderthal[1]. Syn: Neanderthal. [WordNet 1.5]WordNet (r) 3.0 (2006):
Neanderthalian adj 1: relating to or belonging to or resembling Neanderthal man; "Neanderthal skull" [syn: Neanderthal, Neanderthalian, Neandertal]