What is Naught?

Legal Definition
In old practice. Bad; defective. "The bar is naught." 1 Leon. 77. "The avowry is naught." 5 Mod. 73. "The plea Is undoubtedly naught." 10 Mod. 329. See 11 Mod. 179.
-- Black's Law Dictionary
Legal Definition
Defective.
-- Ballentine's Law Dictionary