undecidable, n.All

An Undecidable (n.) carries ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a double, contradictory value that always comes from its syntax, not from its content.