An illocutionary denegation is an illocutionary act that is made complex by the negation of its illocutionary force. It expresses that the speaker is not performing a particular illocutionary act.
(English)
I do not promise to come.
This illocutionary act contrasts with I promise not to come, in which the speaker does perform an illocutionary act.
Searle, John, and Daniel Vanderveken. 1985.Foundations of illocutionary logic. Cambridge, England: Cambridge University.