Ethics seeks to resolve questions of human morality by defining concepts such as good and evil, right and wrong, virtue and vice, justice and crime. As a field of intellectual enquiry, moral philosophy also is related to the fields of moral psychology, descriptive ethics, and value theory.
Rushworth Kidder states that "standard definitions of ethics have typically included such phrases as 'the science of the ideal human character' or 'the science of moral duty'". Richard William Paul and Linda Elder define ethics as "a set of concepts and principles that guide us in determining what behavior helps or harms sentient creatures". The Cambridge Dictionary of Philosophy states that the word "ethics" is "commonly used interchangeably with 'morality' ... and sometimes it is used more narrowly to mean the moral principles of a particular tradition, group or individual." Paul and Elder state that most people confuse ethics with behaving in accordance with social conventions, religious beliefs and the law and don't treat ethics as a stand-alone concept.
The word ethics in English refers to several things. It can refer to philosophical ethics or moral philosophy—a project that attempts to use reason to answer various kinds of ethical questions. As the English philosopher Bernard Williams writes, attempting to explain moral philosophy: "What makes an inquiry a philosophical one is reflective generality and a style of argument that claims to be rationally persuasive." Williams describes the content of this area of inquiry as addressing the very broad question, "how one should live". Ethics can also refer to a common human ability to think about ethical problems that is not particular to philosophy. As bioethicist Larry Churchill has written: "Ethics, understood as the capacity to think critically about moral values and direct our actions in terms of such values, is a generic human capacity." Ethics can also be used to describe a particular person's own idiosyncratic principles or habits. For example: "Joe has strange ethics."
The English word "ethics" is derived from an Ancient Greek word, êthikos, which means "relating to one's character". The Ancient Greek adjective êthikos is itself derived from another Greek word, the noun êthos meaning "character, disposition".