caveman

noun

1. An early human or closely related species, popularly held to reside in caves.“The political cartoon showed the politician as a caveman, clubbing the budget depicted as a mammoth.”
2. A brutish or savage person.“The football squad was made up of cavemen who were responsible for trashing many a locker room.”
3. A man with old-fashioned or backward opinions, particularly with regard to women.“Old Sven is a bit of a caveman; he figures giving women the right to vote was a bad idea.”