caveman

Short definition from Wiktionary

Noun

1. 1
   An early human or closely related species, popularly held to reside in caves.
2. 2
   A person with backward, primitive behavior, opinions, or interests.
3. 3
   A person with backward, primitive behavior, opinions, or interests: A brutish person, one who behaves in a rough, uncivilized way.
4. 4
   A person with backward, primitive behavior, opinions, or interests: Someone, especially a man, who has regressive, old-fashioned attitudes, particularly with regard to women; someone opposed to change or modernity.