IPA: //ʌnˈkɒdɪfaɪd//
KK: /ʌnˈkɒdɪfaɪd/
Describing something that has not been formally organized or written down as a set of rules or laws.
The rules of the game were still uncodified, leading to confusion among the players.
Uncodified → It is formed from "un-" (meaning not) and "codified" (from Latin "codificare", meaning to arrange in a code). The word "uncodified" means not arranged or organized into a formal code or system.
Think of 'not' ('un-') having a formal 'code' ('codified') — that's why uncodified means something that isn't organized into a formal system.