[With regard to the adjective 'good'' it's interesting that if I tell you "Meet me by my car in that big parking lot" and you ask me to describe it. If I then say, "It's a yellow car (with a turquoise racing stripe), " you may find it and be able to meet me there. If however I respond, "Tt''s a good car,," you won't be able to find it. Yet you know what I meant: it brakes when you step on the brakes, and when you step on the accelerator, it accelerates; it has seats, doors, windows and headlights, etc.
Technical note: What's the difference between calling it "yellow" and calling it "good"? Yellow is a primary property while good is a second-order property: it is a property-of-properties. It is a value quantifier. In R. S. Hartman's Value Science (value logic) having value and being good are - for Value Theory - analogous to what the quantifiers some and all. are for Logic.
Evil is a well-defined term in the Unified Theory of Ethics, a recently-introduced new paradigm for an old field of study. In this new (yet old) discipline, the concept evil is defined as: the dis-valuation of an individual.
This dis-valuing can be done by a person, a thing, or a system, but if the dignity of the individual is violated evil is present. Ethics directs us to treat individuals with respect and to refrain from harming them.
{Usually the term “evil” is used in a theological context. It is closely related to “devil” and is “live” spelled backwards. From an ethical point of view there are no evil people, just evil deeds, acts, or situations.}
{p.s. If you liked what you read in that paper entitled A Unified Theory of Ethics, and want to see some sequels to it that are much briefer, just type into the Google search box: Ethical Explorations by Marvin C. Katz You will get a list of other enjoyable reading in dialog form - continuing the theme of that fictional conference found in the earlier writings.}
Comments? Questions? All constructive suggestions are most welcome !