/ɑːrˈkeɪɪk/
ar·chaic
BrE /ɑːˈkeɪɪk/
NAmE /ɑːrˈkeɪɪk/
old and no longer used
‘Thou art’ is an archaic form of ‘you are’.
very old-fashioned
SYN outdated
The system is archaic and unfair and needs changing.
from a much earlier or ancient period of history
archaic art