Here's why it's tricky to find an antonym:
* Limited Scope: The term "Aaronic" is specific to a religious and historical context. It's not a general word describing a quality or characteristic.
* No Opposite Concept: There's no readily available opposite concept to "Aaronic" that's equally specific. It's not like "hot" and "cold" or "good" and "bad".
Instead of an antonym, you might consider using these options:
* Non-Aaronic: This simply means "not related to Aaron".
* Levitical: This refers to things related to the tribe of Levi, of which Aaron was a member. This could be used if you want to emphasize a broader religious context but exclude Aaron specifically.
* Other Priestly: This might be used if you want to discuss priests or priestly functions in general, but not specifically those of Aaron.
Ultimately, the best alternative will depend on the specific context of your writing.