unknown origin

Examples (10)

• The painting's unknown origin added to its mystique.
• Investigators are still trying to determine the artifact's unknown origin.
• The mysterious signal seemed to be of unknown origin.
• Reports indicate that the disease has an unknown origin.
• The ancient manuscript had an unknown origin, baffling historians.
• A package of unknown origin was found near the entrance.
• Despite extensive research, the word's unknown origin remains a puzzle.
• The organization deals with refugees of unknown origin.
• This type of flora, of unknown origin, was discovered in the remote jungle.
• The sudden power outage was attributed to an unknown origin.