unappoint
verb/ˌʌnəˈpɔɪnt/
Etymology From un- + appoint. Compare Middle English disapoynten (“to unappoint”).
1
To undo or reverse an appointment.
- "If Mazzilli appointed him," Costa e Silva retorted, "he is going to unappoint him."1991, John W. F. Dulles, Carlos Lacerda, Brazilian Crusader: The years 1960-1977, page 232: