Antonyms of adj protogeometric
1 sense of protogeometric                                               
Sense 1
protogeometric -- (characteristic of the earliest phase of geometric art especially in Greece)
INDIRECT (VIA nonrepresentational) -> representational -- ((used especially of art) depicting objects, figures,or scenes as seen; "representational art"; "representational images")
Similarity of adj protogeometric
1 sense of protogeometric                                               
Sense 1
protogeometric -- (characteristic of the earliest phase of geometric art especially in Greece)
       => nonrepresentational (vs. representational) -- (of or relating to a style of art in which objects do not resemble those known in physical nature)

