WordNet sense 1 (a heavy typeface in use from 15th to 18th centuries):

black letter

WordNet sense 2 (a style of architecture developed in northern France that spread throughout Europe between the 12th and 16th centuries; characterized by slender vertical piers and counterbalancing buttresses and by vaulting and pointed arches):

Gothic architecture

WordNet sense 3 (as if belonging to the Middle Ages; old-fashioned and unenlightened):

mediaeval, medieval

WordNet sense 4 (not modern; of or characteristic of an earlier time):

nonmodern

WordNet sense 5 (being definitely out of the ordinary and unexpected; slightly odd or even a bit weird):

strange, unusual