troglodyte
Noun
Meaning
The wren.
One of any savage race that dwells in caves, instead of constructing dwellings; a cave dweller. Most of the primitive races of man were troglodytes.
An anthropoid ape, as the chimpanzee.
Source: Webster's dictionarySynonyms
Antonyms
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Examples
I seem to myself, among civilised men, an intruder, a troglodyte enamored of decrepitude, plunged into subversive prayers.
The human mind is still something of a troglodyte. Expelled from one falling cavern, its first thought is to find another.
There's a fine line between what would characterize you as a troglodyte and what would characterize you as a brilliant, avant-garde, forward-thinking genius. There's some middle ground.
Made famous by "Star Wars," these troglodyte homes face an uncertain future.
Yes, your friend could be described as out of date, but the word “troglodyte” has a lot of dark overtones.