anepigraphic

[ an-ep-uh-graf-ik ]
/ ænˌɛp əˈgræf ɪk /

adjective

(of a coin, artifact, etc.) without a legend or inscription.
Also an·e·pig·ra·phous [an-uh-pig-ruh-fuh s] /ˌæn əˈpɪg rə fəs/.

Origin of anepigraphic