Bad

Knowing "good" seems to be the foundation

If you were asked to define the word “bad”, most of your explanation would tend towards “opposite of good”.

Interestingly, this phenomenon — if I’m allowed to refer to it as such — places the burden on the knowledge of what serves as a baseline, in this case “good”; since bad is, in a sense, the anti-good.

The clearer your definition of good is, for the circumstance, expectation, plan, e.t.c. is, the clearer your understanding of its bad.

Simplify, and drive for clarity in your definition of “good”, and “bad” will become easier to spot.