Neandertaler 

Kaan Konrad, very rare species or a male person that thinks fucking in a cactus forest is cool.

Kaan: Omg, I just had the time of my life in a cactus forest.

Marija: Omg Kaan, you’re such a Neandertaler!

Neandertaler by marryfromtheblock August 31, 2020

Neandertall 

Too big to be useful or pleasant

Defined in Sting's 'Seven Days' from the album 'Ten Summoner's Tales':

'My rival is... Neandertall

It makes me think...

Perhaps I need a drink.'

Neandertall by ZEN_747 November 30, 2010

Neanderthalesque 

Someone who is incredibly stupid beyond description

american conservativism is the most backwards neanderthalesque ideology

Neanderthalesque by Jurchy July 20, 2021