Un*sound"ness

from The Collaborative International Dictionary of English v.0.48

Unsound \Un*sound"\, a.
   Not sound; not whole; not solid; defective; infirm; diseased.
   [1913 Webster] -- {Un*sound"ly}, adv. -- {Un*sound"ness}, n.
   [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

UNSOUNDNESS. Vide Crib-biting; Roaring; Soundness.