IPA: /nɒnəˈfɪʃəl/
KK: /nɑnəˈfɪʃəl/
Not recognized as official or formal; informal.
The nonofficial report provided a different perspective on the issue.
A person who does not hold an official position or role.
The nonofficial members of the committee provided valuable insights.
Nonofficial → It is formed from "non-" (meaning not) and "official" (from Latin "officialis", meaning pertaining to an office or authority). The word "nonofficial" means not pertaining to an office or authority, indicating something that is not formally recognized or sanctioned.
Think of 'non-' meaning 'not' and 'official' relating to authority — so nonofficial describes something that is not recognized by an authority.