nonattributably

adv

Etymology: From non- + attributably.

1. In a way that is not attributable.

   “I felt moved to sympathy with that member of Mrs Thatcher's Cabinet who had muttered under his breath, and nonattributably, that in Japan the Trade Ministry ranks second and the Foreign Office eighteenth […]”

   “As a warrior, he knew a thousand ways to kill nonattributably. But he didn't lash out.”