Source : Webster's Revised Unabridged Dictionary (1913)

Unscrupulous \Un*scru"pu*lous\, a.
   Not scrupulous; unprincipled. -- {Un*scru"pu*lous*ly}, adv.
   -- {Un*scru"pu*lous*ness}, n.

Source : WordNet®

unscrupulousness
     n : the quality of unscrupulous dishonesty [ant: {scrupulousness}]