1. not measured or explored; having unknown depth or extent
2. not fully understood or investigated
Usage: figurative

Examples

• The cave system remains largely unplumbed by researchers.
• Scientists discovered an unplumbed ocean trench near the island.
• The unplumbed depths of the lake made swimming dangerous.
• Her talent for music was an unplumbed resource.
• The novel explores unplumbed aspects of human nature.
• Many unplumbed mysteries of the universe await discovery.
• The well’s unplumbed depth concerned the drilling crew.