1. capable of being plumbed; able to be measured or sounded with a plumb line or similar instrument
Usage: technical; formal
2. able to be understood or investigated thoroughly; fathomable
Usage: figurative

Examples

• The well was plumbable to a depth of 200 feet.
• Engineers determined that the canyon was plumbable using modern sonar equipment.
• The motivations behind her decision were not easily plumbable.
• The depths of the ocean are not entirely plumbable with current technology.
• His character proved to be more plumbable once we understood his background.
• The architect confirmed that the foundation was plumbable and stable.