NEANDERTHAL Meaning of NEANDERTHAL in English [Ne.an.der.thal] adj (1861) 1 also Ne.an.der.tal : being, relating to, or resembling Neanderthal man 2: suggesting a caveman in appearance, mentality, or behavior -- Neanderthal n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012