* Erasure: If you're thinking of the act of inscribing, the opposite is to erase or remove the inscription.
* Blankness: If you're thinking of a surface that's inscribed, the opposite could be a blank or empty surface.
* Verbal: If the inscription is written, the opposite might be verbal or spoken.
* Non-permanent: If the inscription is permanent, the opposite could be non-permanent or temporary.
Ultimately, the best antonym depends on the specific meaning and context of "inscription" in your situation.