acanonical
adj. C2 Proficiency acanon·i·cal
adj. not following the official rules or standards of a specific group or system. It is often used to describe things that are not part of the official list or set of rules.
adj. not conforming to the established rules, standards, or official lists of a particular system or group. Often used in technical or legal contexts to describe data or documents that fall outside the official schema.
The software failed to process the acanonical file format.
The system rejected the request because the user provided an acanonical email address that did not match the official domain.
In legal studies, an acanonical document is one that lacks the formal authority of a canonical text, often because it was not properly signed or witnessed.