Elementos para a rejeição da ética na filosofia de Martin Heidegger: contribuição para uma metaética fenomenológico-existencial

This work aims to show how the ethical theories from the European philosophical tradition are rejected by the force of three basics philosophical elements from Heidegger’s Being and Time: the phenomenological ontology, the concept of Dasein and the concept of proper temporality. The analysis of this rejection is what we called a Heideggerian Metaethics (taken in a large sense of any critical philosophical approach to ethics). We start with an exposition of some basic elements from traditional ethical theories; secondly, a functional exposition of Heidegger's existential philosophy as exposed in Being and Time; and finally, we formulate some metaethical theses in order to clarify how traditional ethics is rejected by these Heideggerian existential elements. KEY-WORDS: Heidegger; Ethics; Metaethics; Fundamental Ontology; Dasein; Temporality.