Source : Webster's Revised Unabridged Dictionary (1913)

Mistrustful \Mis*trust"ful\, a.
   Having or causing mistrust, suspicions, or forebodings.

         Their light blown out in some mistrustful wood. --Shak.
   -- {Mis*trust"ful*ly}, adv. -- {Mis*trust"ful*ness}, n.

Source : WordNet®

mistrustful
     adj : openly distrustful and unwilling to confide [syn: {leery}, {suspicious},
            {untrusting}, {wary}]