from The Century Dictionary.
- Indifferent; neutral; morally neither right nor wrong.
- Hence Applied by Boyle to a spirit neither acid nor alkaline.
- In medicine, doing neither good nor harm, as a medicament.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Indifferent or neutral.
- adjective (Med.) Incapable of doing either harm or good, as some medicines.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
neither harmfulnor beneficial
Sorry, no etymologies found.
At dawn we convene, an adiaphorous wind caresses us with listless fingers, vainglorious and animal.
And certainly Paul sees the slave / master relationship as adiaphorous at worst so long as the master treats the slave well and the slave is obedient.
Catholic practices adiaphorous (indifferent things, neither good nor bad), hence permissible provided that the proper doctrine were maintained and its import made clear to the people.
But administrators who adopt the wiggle-room approach will tend to be more modest and consultative in interpreting that core, and will often "agree to disagree" on issues that can reasonably be deemed ambiguous or adiaphorous.