Ethical governance is crucial for achieving sustainable development. When ethics, good governance, and democracy are compromised, it creates a negation that hinders progress. A commitment to good governance, including transparency, accountability, and citizen participation, is essential for Nigeria to achieve sustainable development goals. The purpose of this paper is to analysis the implications of ethic, good governance and democracy as a negation for prospective sustainable development. It is in this note, the erosion of ethics and good governance within a democratic framework undermines sustainable development by creating a climate of corruption, inequality and instability. The findings of this paper hinder Nigeria’s progress towards social, economic and environmental well-being, ultimately hindering its ability to achieve sustainable development goals. The ethics of good governance in Nigeria has been in a state of shamble. This paper adopts analytic method in exploring the nature of ethical dispositions, good governance and democracy in Nigeria and its implications as a negation for sustainable development. Democracy in Nigeria has become traumatizing experience due to the evils of corruption, selfish aggrandizement of Nigeria political leaders and the twisted usage of the common good as the ingredient of good democratic experience. For democracy to work there must be a clear expression of the right to freedom of expression, independence of the judiciary, an unhindered opposition and a periodic return to the electorate for assessment in the form of an election. The sustainability of constitutional ethic, good governance and democracy in Nigeria at large solely depends on providing effective and purposeful leadership for the people of Nigeria. The paper recommended that for Nigeria to experience sustainable development there must be an effective use of ethics, good governance and democracy are properly address.