In a way that is not official.

Not officially established. / Implicitly true but withheld and/or contradicted by authority. / Not acting with official authority. / (pharmacology) Not listed in a national pharmacopeia etc.

Not officious.

The quality of being unofficial.

The quality of being unofficial.

The quality of being unofficious.

In a way that is not officious.

Not officiating.

Not made official.

(UK, historical, informal) A token, similar in appearance to a real farthing, used for marketing and small change during the latter 19th century.