Source : Webster's Revised Unabridged Dictionary (1913)

Trustful \Trust"ful\, a.
   1. Full of trust; trusting.

   2. Worthy of trust; faithful; trusty; trustworthy. --
      {Trust"ful*ly},adv. -- {Trust"ful*ness}, n.

Source : WordNet®

trustful
     adj : inclined to believe or confide readily; full of trust;
           "great brown eye, true and trustful"- Nordhoff & Hall
           [syn: {trusting}] [ant: {distrustful}]