The word "vitrified" refers to the process of converting a substance into glass or making it glass-like. So, antonyms for "more vitrified" would refer to substances that are not glassy or do not have a glass-like quality. Some possible antonyms for "more vitrified" might include "porous," "malleable," "ductile," "flexible," "pliable," "elastic," "yielding," "bendable," and "soft." These words describe materials that are easily shaped or molded, rather than being rigid and hard like glass. They also suggest materials that are less brittle or breakable than glass, and more able to bend or deform without cracking or shattering.