Amiable is to benignly as arrogant is to contemptuously.
Here's why:
* Amiable describes someone who is friendly and pleasant.
* Benignly means in a kind and gentle manner.
* Arrogant describes someone who is excessively proud of themselves and thinks they are superior to others.
* Contemptuously means in a way that shows disdain or scorn.
Therefore, both pairs express a contrasting relationship. Amiable and benignly represent positive, friendly behavior, while arrogant and contemptuously represent negative, dismissive behavior.