De-materialized is a term that describes the process of eliminating or reducing the physical form or existence of something. The antonym for de-materialized is materialized, which means to bring into existence or give physical form to something. The opposite of de-materialized can also be tangible, which means something that can be touched, felt, or perceived by the senses. A related antonym is visible, which refers to something that can be seen or observed. Other antonyms for de-materialized might include solid, substantial, or physical, all of which convey the idea of something existing in a concrete, physical form.