denegative

Adjective

 * 1) Of or pertaining to negation. Having the effect or quality of denying or negating.
 *  Derrida draws attention to the denegative logic required to speak of what is most important by not speaking of it, by avoiding speaking of it; a logic he finds at work in apophatic texts from Plato's Timaeus to Eckhart's sermons to Dionysius' hierarchies to Heidegger's late unpublished lectures