Towards a moisty thought - the philosophy in the perspective of Jacques Derrida is a research that intends to present some traits which, although are central to the constitution of the Western Thought, has been excluded by Philosophy along its History. In order to present those structures of thought - constituted to and at the same time excluded by Philosophy itself -, we started with Bacon´s metaphor concerning the term moist, or, more precisely, the moistness of the moist. In his Novum Organum, dedicated to the formulation of a scientific method that avoids error and leads men through the path of the true way of knowledge, Francis Bacon firmly discards the realm of communication which, according to him, constitutes the place of error for excellence. In other words, Bacon understands communication as resulting from the ambiguity occasioned by the wrong use of words. The term moist is then taken as an example to illustrate the equivoques produced by language, because according to Bacon it doesn´t allow a precise definition, being neither dry nor wet. We take Bacon´s attitude as being representative of a typical philosophical attitude with its necessity of clearness, distinction, immunity, contention, determination, consistency, unity, isolation etc. Also, we see the very structure of this attitude as operative in the critics usually addressed to Jacques Derrida and its efforts to offer no precise definition and conceptualization. Contrarily to the classical philosophical thelos, Derrida presents, under the name Deconstruction, a thought which is contaminated and disseminated by its quasi-concepts: namely, the undecidables. A patient analysis of undecidability in Derrida´s first woks constitutes the first part of the thesis, followed by an attempt to formulate an idea of moistness, starting from some characteristics assumed by the deconstructive thought: contamination by Otherness, metaphoricity, ficcionality, traductibility and autobiographical elements of the text.