Unclaimed (adjective)

1. Not having been claimed or taken possession of by anyone.
2. Not having been acknowledged or recognized by anyone.

Origin:

Mid 17th century: from un- (meaning 'not') + the verb claim.

Examples:

1. The luggage was unclaimed, abandoned at the airport baggage claim area.
2. The land was unclaimed, untouched by civilization and waiting to be discovered.
3. The prize was unclaimed, left uncollected and forgotten by the winners.
4. The reward was unclaimed, neglected by those who had earned it.
5. The title was unclaimed, waiting for a worthy challenger to claim it.