Source : Webster's Revised Unabridged Dictionary (1913)

Distrustful \Dis*trust"ful\, a.
   1. Not confident; diffident; wanting confidence or thrust;
      modest; as, distrustful of ourselves, of one's powers.

            Distrustful sense with modest caution speaks.
                                                  --Pope.

   2. Apt to distrust; suspicious; mistrustful. --Boyle. --
      {Dis*trust"ful*ly}, adv. -- {Dis*trust"ful*ness}, n.

Source : WordNet®

distrustfulness
     n : the trait of not trusting others [syn: {distrust}, {mistrust}]
         [ant: {trust}]