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®

trustfully
     adv 1: with trust; in a trusting manner; "she looked at her father
            trustingly" [syn: {trustingly}, {confidingly}] [ant: {distrustfully}]
     2: in a trustful manner; "his mouth grinned trustfully" [syn: {showing
        trust}]