Definition of Neanderthalian in US English:

Neanderthalian

adjective

  • Neanderthal.

noun

  • Neanderthal.

Origin

1920s; earliest use found in H. G. Wells (1866–1946), novelist and social commentator. From Neanderthal + -ian, perhaps after French néanderthalien, néandertalien, adjective.

Pronunciation

Neanderthalian

/nɪˌandəˈtɑːlɪən/