prehistoric

adjectives

belonging to or existing in times before recorded history
"prehistoric settlements"; "prehistoric peoples"
is derived from
of or relating to times before written history
"prehistoric archeology"
is derived from
pertains to
no longer fashionable
"my mother has these prehistoric ideas about proper clothes"
is similar to
not in accord with or not following current fashion
"unfashionable clothes"; "melodrama of a now unfashionable kind"
domain usage
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech