Unreported (adjective)

1. Not reported or communicated to an authority or to the public.
2. Not recorded or documented.
3. Not having received coverage or attention from the media.
4. Not having been made known or disclosed.

Origin:

Mid 17th century: from un- (expressing negation) + reported, past participle of report.

Examples:

1. The accident was unreported and remained a mystery.
2. The unreported income was discovered during an audit.
3. The unreported incident was discovered by chance.
4. The unreported crisis affected many people's lives.
5. The unreported results were suppressed by the government.