unnotify means to cancel (a notification). Lexicurio rates it Sui generis — a strength score of 88 out of 100.
Etymology
From un- + notify.
verb
- To cancel (a notification).“July 3, 1757, Horace Walpole, letter to Sir Horace Mann
I notified to you the settlement of the Ministry, and, contrary to late custom, have not to unnotify it again. However, it took ten days to complete, after an inter-ministerium of exactly three months.”
- To notify (a person) that a prior notification should now be disregarded.“"Well, you unnotify the railroad," Mugivan stormed.”