redenial
/ˌrɛdɪˈniəl/ (RED-i-nee-ul)
Definitions
1. noun
A denial or refusal, especially a polite refusal.
“She gave a redenial to the invitation, citing prior commitments.”
2. verb
To refuse or decline something, especially in a polite manner.
“He redenied the invitation and suggested an alternative date.”