Uninform

After the coroner is informed, it's virtually impossible to uninform him!

Another characteristic of the subject is the educability, that is, to uninform and to exclude.

She jotted a note on her clipboard. “I'm pretty sure it's nothing.” “Most lumps are just thick tissue,” she explained. “But we have to be sure. Because you informed me, we're required to schedule an ultrasound.” “Is there a way to uninform you?” I asked.