Adiaphora is a classy word and antedates the English language by a long time. Twenty-five hundred years ago the philosophical sect of the Sophists talked about adiaphora, and the Cynics did it before them. Diapherein in Greek means to separate, to make a difference. Add the letter alpha (an alpha privative) and it becomes adiapherein. Thus, adiaphora means things that do not make a difference. Or it can mean things that are neither good nor evil. That makes the term a bit too static for good theological use…