uncodified

From un- +‎ codified.

uncodified (not comparable)

1. Not codified, not part of the code of law, not stated as part of a systematic statement of principles.

   Synonyms: non-codified, noncodified

   Antonym: codified

• uncodified is much more common than noncodified:

• unwritten
• unstated
• unofficial
• informal
• tacit
• de facto

uncodified

1. simple past and past participle of uncodify

• “uncodified”, in OneLook Dictionary Search.
• “uncodified”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “uncodified”, in Collins English Dictionary.
• uncodified, non-codified, noncodified, (unwritten*0.1), (unstated*0.1) at the Google Books Ngram Viewer.