accessarily
adv. manner C2 Proficiency ac·ces·sar·i·ly
adv. in a way that is not the main point or is only a small part of something. You use this when something is secondary or not the most important part of a situation.
adv. in a secondary or subordinate manner; as an accessory or in a supporting role. Often used in legal or formal contexts to describe a position of lesser importance.
He was involved in the crime accessarily.
The defendant was found guilty of the crime accessarily, as he had provided the tools but did not participate in the act itself.
While the lead actor received all the public acclaim, the supporting cast performed accessarily, ensuring the production's technical and narrative coherence remained intact throughout the run.
From accessary + -ly.