Archaic

Archaic-adj
1-belonging or relating to a much earlier period
2-used to describe a word or phrase that is no longer in general use but is still encountered in older literature and still sometimes used for special effect
3-no longer useful or efficient

Synonyms
old
ancient
dated
outdated
out-of-date
antiquated
old-fashioned
outmoded
prehistoric
behind the times
antediluvian
modern (antonym)