WordNet sense 1 (relating to or belonging to the Middle Ages):

mediaeval

WordNet sense 2 (characteristic of the time of chivalry and knighthood in the Middle Ages):

knightly, chivalric

WordNet sense 3 (earlier than the present time; no longer current):

past

WordNet sense 4 (as if belonging to the Middle Ages; old-fashioned and unenlightened):

Gothic

WordNet sense 5 (not modern; of or characteristic of an earlier time):

nonmodern