This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Unable to be discovered; hidden perfectly.

adj. Not subject to being produced in response to a discovery request.

That cannot be discovered or found out: as, undiscoverable principles.

adj. not able to be ascertained; resisting discovery

"Or, it may be the the universe has an undiscoverable rational structure."

indeterminable    undeterminable   

non-objective    dime-sized    shutter-lag    part    country